AzureOpenAI with AAD bearer token returns 401 Unauthorized after upgrading to openai Python SDK v2.34.0
Fix 401 Unauthorized error when using Azure AD bearer tokens passed via api_key parameter after upgrading to openai Python SDK 2.34.0+, specifically in Azure APIM proxy setups Includes evidence for OpenAI API troubleshooting demand.
Source-backedLast updated May 21, 20261 sourceNeeds local verification
Error code: 401 - {'error': {'code': '401', 'message': 'Access denied due to invalid subscription key or wrong API endpoint. Make sure to provide a valid key for an active subscription and use a correct regional API endpoint for your resource.'}}
Quick fix
Verify the account session, API key, provider settings, and environment where the failing tool is running.
Updated
Verification status
Source-backed
Evidence
1 public source URL
Before you change production
This page includes public source URLs in the imported troubleshooting record. Compare those references with your version and environment before applying changes.
Reproduce the smallest failing action and save non-secret logs before changing configuration.
Check versions for OpenAI API, related SDKs, package managers, CI runners, and hosting providers.
Change one setting or dependency at a time, then rerun the same failing command or request.
Avoid destructive commands, credential rotation, billing changes, or security relaxations without a rollback plan.
What this error means
Error code: 401 - {'error': {'code': '401', 'message': 'Access denied due to invalid subscription key or wrong API endpoint. Make sure to provide a valid key for an active subscription and use a correct regional API endpoint for your resource.'}} is a OpenAI API failure pattern reported for developers trying to fix 401 unauthorized error when using azure ad bearer tokens passed via api_key parameter after upgrading to openai python sdk 2.34.0+, specifically in azure apim proxy setups. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.
Why this happens
GitHub Issue #3282 on openai/openai-python (opened May 20, 2026). Confirmed bug between v2.33.0 (works) and v2.34.0+ (fails). Root cause: v2.34.0 treats api_key header as api-key instead of Bearer token format. Affected users pass AAD tokens from azure.identity.ClientSecretCredential. PR #3283 submitted. High commercial value because Azure OpenAI is enterprise paid service; auth failure blocks production.
Common causes
GitHub Issue #3282 on openai/openai-python (opened May 20, 2026). Confirmed bug between v2.33.0 (works) and v2.34.0+ (fails). Root cause: v2.34.0 treats api_key header as api-key instead of Bearer token format. Affected users pass AAD tokens from azure.identity.ClientSecretCredential. PR #3283 submitted. High commercial value because Azure OpenAI is enterprise paid service; auth failure blocks production.
Quick fixes
Confirm the exact error signature matches Error code: 401 - {'error': {'code': '401', 'message': 'Access denied due to invalid subscription key or wrong API endpoint. Make sure to provide a valid key for an active subscription and use a correct regional API endpoint for your resource.'}}.
Check the OpenAI API account, local tool state, and provider configuration involved in the failing workflow.
Verify the account session, API key, provider settings, and environment where the failing tool is running.
Platform/tool-specific checks
Verify the command, editor, extension, or API client that produced the error.
Compare local settings with CI, deployment, or editor-level settings when the error appears in only one environment.
Avoid deleting credentials, local model data, or project settings until the failing scope is clear.
Step-by-step troubleshooting
Capture the exact error message and the command, editor action, or request that triggered it.
Check whether the failure is account/auth, quota/rate, model/provider, local runtime, or deployment configuration.
Review the source evidence below and compare it with your environment.
Apply one change at a time and rerun the smallest failing action.
Keep the working fix documented for the team or deployment environment.
How to prevent it
Keep provider/tool configuration documented.
Record non-secret diagnostics such as tool version, provider name, model name, and command path.
Add a lightweight check before CI or production workflows depend on the tool.
Diagnostic flow for this page
Match Error code: 401 - {'error': {'code': '401', 'message': 'Access denied due to invalid subscription key or wrong API endpoint. Make sure to provide a valid key for an active subscription and use a correct regional API endpoint for your resource.'}} exactly before applying the quick fix.
Compare the failing environment with OpenAI API versions, account scope, provider settings, and deployment context.
Check the listed common causes in order, starting with the cause that best matches your logs.
Use the evidence status below to decide whether to confirm against public sources or official documentation.
Apply one reversible change, rerun the smallest failing action, and keep rollback notes.