diff --git a/src/commands/runtime/ip-list/get.js b/src/commands/runtime/ip-list/get.js
index 9a809b47..80312155 100644
--- a/src/commands/runtime/ip-list/get.js
+++ b/src/commands/runtime/ip-list/get.js
@@ -60,28 +60,33 @@ async function getAccessToken () {
   return getToken(contextName)
 }
 
+const ORG_ID_KEYS = ['project.org.ims_org_id', 'console.org.code', 'ims.org_id']
+
 /**
- * Resolve the caller's IMS org id from local aio config, or null if no
- * binding is configured. The service validates the IMS token against
- * the claimed imsOrgId and rejects mismatches with 400, so an unbound
- * shell must short-circuit before any network call.
+ * Resolve the caller's IMS org id from aio config, returning the value
+ * along with the key and scope it was read from so error paths can
+ * route remediation to the right config surface.
+ *
+ * Key precedence:
+ *   - `project.org.ims_org_id` — written by `aio app use` to both global
+ *     config and the project's local `.aio` file; scope is probed
+ *     explicitly since the key name alone is ambiguous.
+ *   - `console.org.code` — written by `aio console org select` (global).
+ *   - `ims.org_id` — legacy, retained for back-compat.
  *
- * Key precedence reflects what each aio flow actually writes:
- *   - `project.org.ims_org_id` — populated by `aio app use` in the
- *     local project config; most specific binding.
- *   - `console.org.code` — populated by `aio console org select`. Note
- *     this is the `@AdobeOrg` value despite the field name; the sibling
- *     `console.org.id` is the Developer Console numeric id, which the
- *     service does not accept.
- *   - `ims.org_id` — legacy key retained for back-compat.
+ * Scope precedence matches aio-lib-core-config's merge order:
+ * env > local > global.
  *
- * @returns {string|null} IMS org id in `...@AdobeOrg` form, or null.
+ * @returns {{orgId: string|null, key: string|null, scope: 'local'|'global'|'env'|null}}
  */
 function resolveImsOrgId () {
-  return config.get('project.org.ims_org_id') ||
-    config.get('console.org.code') ||
-    config.get('ims.org_id') ||
-    null
+  for (const key of ORG_ID_KEYS) {
+    for (const scope of ['env', 'local', 'global']) {
+      const value = config.get(key, scope)
+      if (value) return { orgId: value, key, scope }
+    }
+  }
+  return { orgId: null, key: null, scope: null }
 }
 
 /**
@@ -187,6 +192,48 @@ async function postAcceptTerms ({ host, token, orgId, contactEmail, termsVersion
   })
 }
 
+/**
+ * Build the error message shown when the service returns 403 because the IMS token does not grant access to the org id we sent. The
+ * remediation depends on where the org id came from: if it was read from the local .aio config, the user needs to update that config
+ * (e.g. by re-running `aio app use`). But if it came from the global config or env, the user needs to save their saved org selection (e.g. by re-running `aio console org select`).
+ *
+ * @param {object} opts
+ * @param {string} opts.orgId - org id rejected by the service.
+ * @param {string} opts.orgIdKey - aio config key it was read from.
+ * @param {'local'|'global'|'env'} opts.orgIdScope - source surface.
+ * @returns {string} multi-line message for this.error().
+ */
+function formatStaleOrgError ({ orgId, orgIdKey, orgIdScope }) {
+  if (orgIdScope === 'local') {
+    return (
+      "Unable to fetch Runtime egress IPs for this project's Adobe org.\n\n" +
+      "This project's local .aio is configured to use:\n" +
+      `  ${orgId}\n` +
+      `  (from '${orgIdKey}')\n\n` +
+      'but your current Adobe I/O login does not appear to have access to that org.\n\n' +
+      'To see the orgs available to your current login, run:\n' +
+      '  aio console org list\n\n' +
+      `Then either log in as an account with access to ${orgId}, ` +
+      'or re-bind this project to an accessible org with:\n' +
+      '  aio app use'
+    )
+  }
+  // global, env, or unknown — all read as a "saved" CLI selection.
+  return (
+    'Unable to fetch Runtime egress IPs for the saved Adobe org.\n\n' +
+    'The CLI is using the saved org:\n' +
+    `  ${orgId}\n` +
+    `  (from '${orgIdKey}'${orgIdScope === 'env' ? ' env var' : ''})\n\n` +
+    'but your current Adobe I/O login does not appear to have access to it.\n\n' +
+    'To see the orgs available to your current login, run:\n' +
+    '  aio console org list\n\n' +
+    'Then update the saved org selection:\n' +
+    '  aio console org select\n\n' +
+    'After that, retry:\n' +
+    '  aio runtime ip-list get'
+  )
+}
+
 /**
  * Render the ip-list service response as a terminal-friendly block
  * grouped by region.
@@ -231,13 +278,15 @@ class IpListGet extends RuntimeBaseCommand {
   // or this.wsk().
   async run () {
     const { flags } = await this.parse(IpListGet)
-    if (flags.region && !VALID_REGIONS.includes(flags.region)) {
+    const region = flags.region && flags.region.toLowerCase()
+    if (region && !VALID_REGIONS.includes(region)) {
       this.error(`invalid region "${flags.region}". Expected one of: ${VALID_REGIONS.join(', ')}`, { exit: 1 })
     }
+    flags.region = region
     if (flags['accept-terms'] && !flags['contact-email']) {
       this.error('--accept-terms requires --contact-email', { exit: 1 })
     }
-    const orgId = resolveImsOrgId()
+    const { orgId, key: orgIdKey, scope: orgIdScope } = resolveImsOrgId()
     if (!orgId) {
       this.error(
         'IMS org id not found in aio config.\n\n' +
@@ -249,13 +298,15 @@ class IpListGet extends RuntimeBaseCommand {
     }
 
     try {
-      await this.runPipeline(flags, orgId)
+      await this.runPipeline(flags, orgId, orgIdKey, orgIdScope)
     } catch (err) {
+      // re-throw them as-is so the customer sees only the friendly message, no prefix or stack trace
+      if (err && err.oclif) throw err
       await this.handleError('failed to fetch the egress IP list', err)
     }
   }
 
-  async runPipeline (flags, orgId) {
+  async runPipeline (flags, orgId, orgIdKey, orgIdScope) {
     const host = resolveHost(flags)
     const token = await getAccessToken()
 
@@ -272,6 +323,11 @@ class IpListGet extends RuntimeBaseCommand {
       }
     }
 
+    if (res.status === 403 && res.body && /does not grant access/i.test(res.body.error || '')) {
+      // The token is valid, but the resolved org is not accessible to the current login
+      this.error(formatStaleOrgError({ orgId, orgIdKey, orgIdScope }), { exit: 1 })
+    }
+
     if (res.status !== 200) {
       const detail = (res.body && (res.body.error || res.body.message)) || res.rawBody || `http ${res.status}`
       this.error(`ip-list service returned ${res.status}: ${detail}`)
diff --git a/test/commands/runtime/ip-list/get.test.js b/test/commands/runtime/ip-list/get.test.js
index d0bd17c4..82aa72e5 100644
--- a/test/commands/runtime/ip-list/get.test.js
+++ b/test/commands/runtime/ip-list/get.test.js
@@ -94,8 +94,12 @@ beforeEach(() => {
   stdout.start()
   stderr.start()
 
-  config.get.mockImplementation((key) => {
-    if (key === 'project.org.ims_org_id') return 'BA3E111222@AdobeOrg'
+  // Default binding: project.org.ims_org_id in global scope. Tests that
+  // need a local-.aio or env binding override this in-place.
+  config.get.mockImplementation((key, scope) => {
+    if (key === 'project.org.ims_org_id' && (scope === undefined || scope === 'global')) {
+      return 'BA3E111222@AdobeOrg'
+    }
     return undefined
   })
   context.getCurrent.mockResolvedValue(null)
@@ -312,6 +316,22 @@ describe('run() — happy path', () => {
     expect(body.surface).toBe('cli')
   })
 
+  test('--region accepts uppercase and forwards lowercase', async () => {
+    global.fetch.mockResolvedValueOnce(fetchResponse(200, IP_LIST_OK))
+    const cmd = makeCommand(['--region', 'AUS'])
+    await cmd.run()
+    const body = JSON.parse(global.fetch.mock.calls[0][1].body)
+    expect(body.region).toBe('aus')
+  })
+
+  test('--region accepts mixed case and forwards lowercase', async () => {
+    global.fetch.mockResolvedValueOnce(fetchResponse(200, IP_LIST_OK))
+    const cmd = makeCommand(['--region', 'Aus'])
+    await cmd.run()
+    const body = JSON.parse(global.fetch.mock.calls[0][1].body)
+    expect(body.region).toBe('aus')
+  })
+
   test('--service-host overrides the default', async () => {
     global.fetch.mockResolvedValueOnce(fetchResponse(200, IP_LIST_OK))
     const cmd = makeCommand(['--service-host', 'custom.adobeioruntime.net'])
@@ -343,6 +363,12 @@ describe('run() — input validation', () => {
     expect(global.fetch).not.toHaveBeenCalled()
   })
 
+  test('unknown region error preserves the user-supplied casing', async () => {
+    const cmd = makeCommand(['--region', 'MARS'])
+    await expect(cmd.run()).rejects.toThrow(/invalid region "MARS"/)
+    expect(global.fetch).not.toHaveBeenCalled()
+  })
+
   test('rejects --accept-terms without --contact-email', async () => {
     const cmd = makeCommand(['--accept-terms'])
     await expect(cmd.run()).rejects.toThrow(/--accept-terms requires --contact-email/)
@@ -367,9 +393,11 @@ describe('run() — input validation', () => {
     // After `aio console org select` without a subsequent `aio app use`,
     // the IMS org id is stored at console.org.code rather than
     // project.org.ims_org_id; the command must resolve it from there.
-    config.get.mockImplementation((key) => {
+    config.get.mockImplementation((key, scope) => {
       if (key === 'project.org.ims_org_id') return undefined
-      if (key === 'console.org.code') return 'C74F69D7594880280A495D09@AdobeOrg'
+      if (key === 'console.org.code' && (scope === undefined || scope === 'global')) {
+        return 'C74F69D7594880280A495D09@AdobeOrg'
+      }
       return undefined
     })
     global.fetch.mockResolvedValueOnce(fetchResponse(200, IP_LIST_OK))
@@ -382,7 +410,8 @@ describe('run() — input validation', () => {
   test('prefers project.org.ims_org_id over console.org.code when both are set', async () => {
     // An explicit `aio app use` binding (project-local) takes precedence
     // over the global `aio console org select` binding.
-    config.get.mockImplementation((key) => {
+    config.get.mockImplementation((key, scope) => {
+      if (scope !== undefined && scope !== 'global') return undefined
       if (key === 'project.org.ims_org_id') return 'PROJECT111@AdobeOrg'
       if (key === 'console.org.code') return 'CONSOLE222@AdobeOrg'
       return undefined
@@ -395,6 +424,133 @@ describe('run() — input validation', () => {
   })
 })
 
+describe('run() — stale org id (403 token/org mismatch)', () => {
+  // Service envelope: 403 with `{error: "token does not grant access to org X@AdobeOrg"}`.
+  // Remediation routes by the source scope of the resolved org id:
+  // global/env → "saved org" + `aio console org select`; local → "this
+  // project" + `aio app use`.
+
+  test('global-config scope surfaces the "saved org" remediation', async () => {
+    config.get.mockImplementation((key, scope) => {
+      if (scope !== undefined && scope !== 'global') return undefined
+      if (key === 'console.org.code') return 'STALE111@AdobeOrg'
+      return undefined
+    })
+    global.fetch.mockResolvedValueOnce(fetchResponse(403, {
+      error: 'token does not grant access to org STALE111@AdobeOrg'
+    }))
+    let caught
+    try { await makeCommand([]).run() } catch (e) { caught = e }
+    expect(caught).toBeDefined()
+    expect(caught.message).toMatch(/saved Adobe org/)
+    expect(caught.message).toMatch(/STALE111@AdobeOrg/)
+    expect(caught.message).toMatch(/console\.org\.code/)
+    expect(caught.message).toMatch(/aio console org list/)
+    expect(caught.message).toMatch(/aio console org select/)
+    // `aio app use` is the local-binding remediation; it must not
+    // appear on the global-scope path.
+    expect(caught.message).not.toMatch(/aio app use/)
+  })
+
+  test('local .aio scope surfaces the project-binding remediation', async () => {
+    config.get.mockImplementation((key, scope) => {
+      if (key === 'project.org.ims_org_id' && (scope === undefined || scope === 'local')) {
+        return 'PROJBOUND@AdobeOrg'
+      }
+      return undefined
+    })
+    global.fetch.mockResolvedValueOnce(fetchResponse(403, {
+      error: 'token does not grant access to org PROJBOUND@AdobeOrg'
+    }))
+    let caught
+    try { await makeCommand([]).run() } catch (e) { caught = e }
+    expect(caught).toBeDefined()
+    expect(caught.message).toMatch(/this project's Adobe org/)
+    expect(caught.message).toMatch(/PROJBOUND@AdobeOrg/)
+    expect(caught.message).toMatch(/project\.org\.ims_org_id/)
+    expect(caught.message).toMatch(/aio app use/)
+    expect(caught.message).toMatch(/aio console org list/)
+    // `aio console org select` would mutate the global selection
+    // without fixing the local .aio binding that resolved here.
+    expect(caught.message).not.toMatch(/aio console org select/)
+  })
+
+  test('env-var scope surfaces the "saved org" remediation and labels the source as env', async () => {
+    config.get.mockImplementation((key, scope) => {
+      if (key === 'project.org.ims_org_id' && scope === 'env') return 'ENVORG@AdobeOrg'
+      return undefined
+    })
+    global.fetch.mockResolvedValueOnce(fetchResponse(403, {
+      error: 'token does not grant access to org ENVORG@AdobeOrg'
+    }))
+    let caught
+    try { await makeCommand([]).run() } catch (e) { caught = e }
+    expect(caught).toBeDefined()
+    expect(caught.message).toMatch(/saved Adobe org/)
+    expect(caught.message).toMatch(/env var/)
+  })
+
+  test('non-matching 403 body falls through to the generic error', async () => {
+    // Unrelated 403s (auth failures, etc.) must not be misclassified.
+    // TERMS_REQUIRED is matched earlier and covered separately.
+    global.fetch.mockResolvedValueOnce(fetchResponse(403, { error: 'something else' }))
+    const cmd = makeCommand([])
+    await expect(cmd.run()).rejects.toThrow(/ip-list service returned 403: something else/)
+  })
+
+  test('403 with a non-JSON body falls through to the generic error', async () => {
+    // A 403 from an upstream proxy may arrive as HTML rather than JSON;
+    // res.body is null and the stale-org matcher must short-circuit
+    // instead of throwing on the missing field.
+    global.fetch.mockResolvedValueOnce(fetchResponse(403, '<html>forbidden</html>'))
+    const cmd = makeCommand([])
+    await expect(cmd.run()).rejects.toThrow(/ip-list service returned 403/)
+  })
+
+  test('403 with a JSON body missing `error` falls through to the generic error', async () => {
+    // res.body is present but does not carry an `error` field, so the
+    // matcher exercises the `res.body.error || ''` fallback and short-circuits.
+    global.fetch.mockResolvedValueOnce(fetchResponse(403, { message: 'forbidden' }))
+    const cmd = makeCommand([])
+    await expect(cmd.run()).rejects.toThrow(/ip-list service returned 403: forbidden/)
+  })
+
+  test('unexpected (non-CLIError) exceptions are wrapped by handleError', async () => {
+    // Inverse of the regression test below: a plain Error from inside
+    // runPipeline (e.g. IMS unreachable) should be wrapped with the
+    // "failed to fetch the egress IP list:" prefix so the user gets
+    // context rather than a bare stack trace.
+    getToken.mockRejectedValueOnce(new Error('IMS unreachable'))
+    let caught
+    try { await makeCommand([]).run() } catch (e) { caught = e }
+    expect(caught).toBeDefined()
+    expect(caught.message).toMatch(/failed to fetch the egress IP list/)
+    expect(caught.message).toMatch(/IMS unreachable/)
+  })
+
+  test('friendly stale-org error is not re-wrapped by the outer error handler', async () => {
+    // RuntimeBaseCommand#handleError prefixes inner errors with
+    // "failed to fetch the egress IP list:" and appends a
+    // "--verbose flag for more information" hint. That wrapping is
+    // appropriate for unexpected exceptions, not for messages the
+    // command crafted on purpose; the stale-org message must reach
+    // the user verbatim.
+    config.get.mockImplementation((key, scope) => {
+      if (scope !== undefined && scope !== 'global') return undefined
+      if (key === 'console.org.code') return 'STALE111@AdobeOrg'
+      return undefined
+    })
+    global.fetch.mockResolvedValueOnce(fetchResponse(403, {
+      error: 'token does not grant access to org STALE111@AdobeOrg'
+    }))
+    let caught
+    try { await makeCommand([]).run() } catch (e) { caught = e }
+    expect(caught).toBeDefined()
+    expect(caught.message).not.toMatch(/failed to fetch the egress IP list/)
+    expect(caught.message).not.toMatch(/--verbose flag for more information/)
+  })
+})
+
 describe('run() — terms acceptance flow', () => {
   test('accepts terms non-interactively with --accept-terms + --contact-email, then retries the GET', async () => {
     global.fetch