diff --git a/cli/dstack/_internal/core/error.py b/cli/dstack/_internal/core/error.py
index 23c5a456e..aeeec244b 100644
--- a/cli/dstack/_internal/core/error.py
+++ b/cli/dstack/_internal/core/error.py
@@ -12,12 +12,14 @@ class BackendError(DstackError):
 
 class BackendAuthError(BackendError):
     code = "invalid_backend_credentials"
-    message = "Backend credentials are invalid"
+
+
+class BackendNotAvailableError(BackendError):
+    code = "backend_not_available"
 
 
 class NoMatchingInstanceError(BackendError):
     code = "no_matching_instance"
-    message = "No instance type matching requirements"
 
 
 class RepoNotInitializedError(DstackError):
diff --git a/cli/dstack/_internal/hub/background/tasks/resubmit_jobs.py b/cli/dstack/_internal/hub/background/tasks/resubmit_jobs.py
index 88a45e72a..5e0a9b205 100644
--- a/cli/dstack/_internal/hub/background/tasks/resubmit_jobs.py
+++ b/cli/dstack/_internal/hub/background/tasks/resubmit_jobs.py
@@ -31,8 +31,10 @@ async def _resubmit_projects_jobs(projects: List[Project]):
                 "Credentials for %s project are invalid. Skipping job resubmission.", project.name
             )
             continue
-        configurator = get_configurator(backend.name)
-        if configurator is None:
+        if backend is None or get_configurator(backend.name) is None:
+            logger.warning(
+                "Missing dependencies for %s. Skipping job resubmission.", project.backend
+            )
             continue
         await run_async(_resubmit_backend_jobs, backend)
         logger.info("Finished resubmitting jobs for %s project", project.name)
diff --git a/cli/dstack/_internal/hub/routers/projects.py b/cli/dstack/_internal/hub/routers/projects.py
index b7eade317..d324021c5 100644
--- a/cli/dstack/_internal/hub/routers/projects.py
+++ b/cli/dstack/_internal/hub/routers/projects.py
@@ -114,9 +114,9 @@ async def update_project(
     configurator = get_backend_configurator(project_info.backend.__root__.type)
     try:
         await run_async(configurator.configure_project, project_info.backend.__root__)
+        await ProjectManager.update_project_from_info(project_info)
     except BackendConfigError as e:
         _error_response_on_config_error(e, path_to_config=["backend"])
-    await ProjectManager.update_project_from_info(project_info)
     clear_backend_cache(project_info.project_name)
     return project_info
 
diff --git a/cli/dstack/_internal/hub/routers/runners.py b/cli/dstack/_internal/hub/routers/runners.py
index eb7c4fb7b..3b3932eee 100644
--- a/cli/dstack/_internal/hub/routers/runners.py
+++ b/cli/dstack/_internal/hub/routers/runners.py
@@ -26,7 +26,7 @@ async def run_runners(project_name: str, job: Job):
         raise HTTPException(
             status_code=status.HTTP_400_BAD_REQUEST,
             detail=error_detail(
-                NoMatchingInstanceError.message, code=NoMatchingInstanceError.code
+                "No instance type matching requirements", code=NoMatchingInstanceError.code
             ),
         )
     except BuildNotFoundError as e:
diff --git a/cli/dstack/_internal/hub/routers/util.py b/cli/dstack/_internal/hub/routers/util.py
index 909e2e4e2..1058e6de7 100644
--- a/cli/dstack/_internal/hub/routers/util.py
+++ b/cli/dstack/_internal/hub/routers/util.py
@@ -3,7 +3,7 @@
 from fastapi import HTTPException, status
 
 from dstack._internal.backend.base import Backend
-from dstack._internal.core.error import BackendAuthError
+from dstack._internal.core.error import BackendAuthError, BackendNotAvailableError
 from dstack._internal.hub.models import Project
 from dstack._internal.hub.repository.projects import ProjectManager
 from dstack._internal.hub.services.backends import cache as backends_cache
@@ -28,7 +28,7 @@ async def get_backend(project: Project) -> Optional[Backend]:
     except BackendAuthError:
         raise HTTPException(
             status_code=status.HTTP_400_BAD_REQUEST,
-            detail=error_detail(BackendAuthError.message, code=BackendAuthError.code),
+            detail=error_detail("Backend credentials are invalid", code=BackendAuthError.code),
         )
 
 
@@ -37,7 +37,10 @@ def get_backend_configurator(backend_type: str) -> Configurator:
     if configurator is None:
         raise HTTPException(
             status_code=status.HTTP_400_BAD_REQUEST,
-            detail=error_detail(f"Backend {backend_type} not available"),
+            detail=error_detail(
+                f"Backend {backend_type} not available. Ensure the dependencies for {backend_type} are installed.",
+                code=BackendNotAvailableError.code,
+            ),
         )
     return configurator
 
diff --git a/cli/dstack/_internal/hub/services/backends/aws/configurator.py b/cli/dstack/_internal/hub/services/backends/aws/configurator.py
index 7118c4508..51a21dc46 100644
--- a/cli/dstack/_internal/hub/services/backends/aws/configurator.py
+++ b/cli/dstack/_internal/hub/services/backends/aws/configurator.py
@@ -174,11 +174,15 @@ def _get_hub_extra_regions_element(
     def _get_hub_buckets_element(
         self, session: Session, region: str, selected: Optional[str]
     ) -> AWSBucketProjectElement:
-        if selected is not None:
+        if selected:
             self._validate_hub_bucket(session=session, region=region, bucket_name=selected)
         element = AWSBucketProjectElement(selected=selected)
         s3_client = session.client("s3")
-        response = s3_client.list_buckets()
+        try:
+            response = s3_client.list_buckets()
+        except botocore.exceptions.ClientError:
+            # We'll suggest no buckets if the user has no permission to list them
+            return element
         for bucket in response["Buckets"]:
             element.values.append(
                 AWSBucketProjectElementValue(
diff --git a/cli/dstack/_internal/hub/services/backends/lambdalabs/configurator.py b/cli/dstack/_internal/hub/services/backends/lambdalabs/configurator.py
index 5d3841e3a..9c0fcf59b 100644
--- a/cli/dstack/_internal/hub/services/backends/lambdalabs/configurator.py
+++ b/cli/dstack/_internal/hub/services/backends/lambdalabs/configurator.py
@@ -2,6 +2,7 @@
 from typing import Dict, List, Optional, Tuple, Union
 
 import botocore
+import botocore.exceptions
 from boto3.session import Session
 from requests import HTTPError
 
@@ -192,7 +193,11 @@ def _get_aws_bucket_element(
     ) -> ProjectElement:
         element = ProjectElement(selected=selected)
         s3_client = session.client("s3")
-        response = s3_client.list_buckets()
+        try:
+            response = s3_client.list_buckets()
+        except botocore.exceptions.ClientError:
+            # We'll suggest no buckets if the user has no permission to list them
+            return element
         bucket_names = []
         for bucket in response["Buckets"]:
             bucket_names.append(bucket["Name"])
@@ -226,6 +231,16 @@ def _get_aws_storage_backend_config_data(
 
     def _get_aws_bucket_region(self, session: Session, bucket: str) -> str:
         s3_client = session.client("s3")
-        response = s3_client.head_bucket(Bucket=bucket)
+        try:
+            response = s3_client.head_bucket(Bucket=bucket)
+        except botocore.exceptions.ClientError:
+            raise BackendConfigError(
+                "Permissions for getting bucket region are required",
+                code="permissions_error",
+                fields=[
+                    ["storage_backend", "credentials", "access_key"],
+                    ["storage_backend", "credentials", "secret_key"],
+                ],
+            )
         region = response["ResponseMetadata"]["HTTPHeaders"]["x-amz-bucket-region"]
         return region
diff --git a/cli/dstack/api/hub/_api_client.py b/cli/dstack/api/hub/_api_client.py
index 07f18c188..271473d7b 100644
--- a/cli/dstack/api/hub/_api_client.py
+++ b/cli/dstack/api/hub/_api_client.py
@@ -6,7 +6,7 @@
 
 from dstack._internal.core.artifact import Artifact
 from dstack._internal.core.build import BuildNotFoundError
-from dstack._internal.core.error import NoMatchingInstanceError
+from dstack._internal.core.error import BackendNotAvailableError, NoMatchingInstanceError
 from dstack._internal.core.job import Job, JobHead
 from dstack._internal.core.log_event import LogEvent
 from dstack._internal.core.plan import RunPlan
@@ -675,6 +675,12 @@ def _make_hub_request(request_func, host, *args, **kwargs) -> requests.Response:
             raise HubClientError(
                 f"Got 500 Server Error from hub: {url}. Check server logs for details."
             )
+        elif resp.status_code == 400:
+            body = resp.json()
+            detail = body.get("detail")
+            if detail is not None:
+                if detail.get("code") == BackendNotAvailableError.code:
+                    raise HubClientError(detail["msg"])
         return resp
     except requests.ConnectionError:
         raise HubClientError(f"Cannot connect to hub at {host}")
diff --git a/docs/docs/reference/backends/aws.md b/docs/docs/reference/backends/aws.md
index d90e8bd8a..eafe478be 100644
--- a/docs/docs/reference/backends/aws.md
+++ b/docs/docs/reference/backends/aws.md
@@ -38,16 +38,26 @@ services.
         {
           "Effect": "Allow",
           "Action": [
-              "s3:PutObject",
-              "s3:GetObject",
-              "s3:DeleteObject",
-              "s3:ListBucket",
-              "s3:GetLifecycleConfiguration",
-              "s3:PutLifecycleConfiguration",
-              "s3:PutObjectTagging",
-              "s3:GetObjectTagging",
-              "s3:DeleteObjectTagging",
-              "s3:GetBucketAcl"
+            "s3:ListAllMyBuckets",
+            "s3:GetBucketLocation"
+          ],
+          "Resource": [
+            "arn:aws:s3:::*"
+          ]
+        },
+        {
+          "Effect": "Allow",
+          "Action": [
+            "s3:PutObject",
+            "s3:GetObject",
+            "s3:DeleteObject",
+            "s3:ListBucket",
+            "s3:GetLifecycleConfiguration",
+            "s3:PutLifecycleConfiguration",
+            "s3:PutObjectTagging",
+            "s3:GetObjectTagging",
+            "s3:DeleteObjectTagging",
+            "s3:GetBucketAcl"
           ],
           "Resource": [
             "arn:aws:s3:::{bucket_name}",