diff --git a/changelog/17835.txt b/changelog/17835.txt
new file mode 100644
index 0000000000000..3c48884364c5a
--- /dev/null
+++ b/changelog/17835.txt
@@ -0,0 +1,3 @@
+```release-note:improvement
+ui: mfa: use proper request id generation
+```
diff --git a/ui/mirage/handlers/mfa-login.js b/ui/mirage/handlers/mfa-login.js
index 61dd66bb99192..34d4b7583e881 100644
--- a/ui/mirage/handlers/mfa-login.js
+++ b/ui/mirage/handlers/mfa-login.js
@@ -93,11 +93,7 @@ export default function (server) {
     } else if (user === 'mfa-j') {
       [mfa_constraints, methods] = generator([m('pingid')]); // use to test push failures
     }
-    const numbers = (length) =>
-      Math.random()
-        .toString()
-        .substring(2, length + 2);
-    const mfa_request_id = `${numbers(8)}-${numbers(4)}-${numbers(4)}-${numbers(4)}-${numbers(12)}`;
+    const mfa_request_id = crypto.randomUUID();
     const mfa_requirement = {
       mfa_request_id,
       mfa_constraints,