Experiencing authentication issues

Hey Andreas, sorry you’re running into that timeout and token validation error in the Azure portal – that can be really frustrating when you just want to manage an App Registration. Here are a few things to try and some questions to help narrow it down:

What to try first

1. Clean up your browser session • Sign out of the Azure portal, clear cookies/storage for portal.azure.com, then sign back in. • Try an incognito/private‐browsing window or a different browser altogether.
2. Check your network/firewall • Make sure nothing (proxy, VPN, corporate firewall) is blocking these common AAD/auth endpoints: – login.microsoftonline.com – login.windows.net – login.microsoft.com – graph.microsoft.com • If you have strict outbound rules, you may need to whitelist Microsoft Entra identity endpoints.
3. Use the CLI or PowerShell as a workaround You can manage your App Registration outside the portal with commands like: az login az ad app list az ad app create --display-name "MyApp" --identifier-uris "https://…" Or use the Microsoft Graph PowerShell/REST API to view/update your app.
4. Check conditional‐access or guest‐tenant scenarios • Are you in more than one AAD tenant or using a guest account? • Any recent Conditional Access policies or MFA requirements applied?

Follow-up questions to help troubleshoot

1. Does the timeout/token error happen in multiple browsers or devices?
2. Can you reproduce the issue from a different network (home versus corporate)?
3. Are you using any custom DNS or host-file entries for Azure endpoints?
4. When did this start happening? Any recent network or policy changes?
5. Do you see any errors if you run az account get-access-token ––resource https://management.azure.com/ ?

Once we’ve got those details, we can pinpoint whether it’s a client/session issue, a network block, or something on the AAD side. Meanwhile, the CLI/Graph API approach will let you manage your 2024 app registration so you can keep working on that OneDrive/Graph integration without the portal blocking you.

References

• App Authentication client library for .NET – version 1.6.0 (troubleshooting local & MSI tokens) https://learn.microsoft.com/dotnet/api/overview/azure/service-to-service-authentication?view=azure-dotnet#appauthentication-troubleshooting
• App configuration support – Authentication guidance https://learn.microsoft.com/azure/developer/java/spring-framework/app-configuration-support?wt.mc_id=knowledgesearch_inproduct_azure-cxp-community-insider#authentication
• Microsoft Entra authentication – common 401 errors & solutions https://learn.microsoft.com/azure/azure-app-configuration/rest-api-authentication-azure-ad?wt.mc_id=knowledgesearch_inproduct_azure-cxp-community-insider#errors
• HMAC authentication – REST API reference & 401 error codes https://learn.microsoft.com/azure/azure-app-configuration/rest-api-authentication-hmac?wt.mc_id=knowledgesearch_inproduct_azure-cxp-community-insider#authorization-header

Note: This content was drafted with the help of an AI system. Please verify the information before relying on it for decision-making.

Hello Buteweg, Andreas,

Are you still having the issue? Let me know if you need any assistance. We can discuss this offline to better understand and resolve it quickly. Please share your email address and available times in a private message.