Review User Permissions:
- Meticulously examine the affected users' permissions in both Azure AD and the application itself.
- Ensure they have the necessary permissions to access their profiles.
- Verify if any conditional access policies or security restrictions might be blocking access.
- Compare their permissions with those of users who can access successfully.
- If consent hasn't been granted or has expired, re-grant consent for the application. **Inspect Token Permissions:** - Analyze the access tokens being used for the affected users. - Ensure they contain the correct scopes for accessing user profiles. - Use tools like the Microsoft Graph Explorer or Postman to test token validity. **Verify Audience Claims:** - Ensure the audience claims (aud) in the access tokens match the Microsoft Graph API endpoints being called. - Mismatches can lead to 403 errors. **Test with Graph Explorer:** - Use the Graph Explorer ([https://developer.microsoft.com/graph/graph-explorer](https://developer.microsoft.com/graph/graph-explorer)) to try accessing the affected users' profiles with their access tokens. - This can help isolate whether the issue is with the application or with the Graph API itself. **Review Recent Changes:** - Scrutinize any recent changes to Azure AD policies, conditional access rules, or application configurations that might have inadvertently impacted access. **Engage Microsoft Support:** - If none of the above steps resolve the issue, engage Microsoft support for further assistance. - They have access to more detailed logs and diagnostic tools to pinpoint the root cause. **Additional Considerations:** - **Conditional Access Policies:** Double-check for any conditional access policies that might be affecting specific users or devices. - **Azure AD Security Defaults:** If enabled, ensure the application is explicitly allowed to bypass security defaults. - **Application Permissions:** Verify that the application has the necessary permissions to access user profiles in Microsoft Graph. - **Recent Updates:** Review any recent updates to Microsoft Graph or Azure AD that might have introduced changes related to permissions or access control. **Seek Community Insights:**
- Verify if any conditional access policies or security restrictions might be blocking access.
- Ensure they have the necessary permissions to access their profiles.
- Share your experiences in relevant forums or communities for further assistance and potential workarounds from other developers.