Request Id: <PII-removed> Correlation Id: <PII-removed> Timestamp: 2026-01-23T09:05:49Z Message: AADSTS900561: The endpoint only accepts POST requests. Received a GET request.

Hi Gábor Dobos

Thank you for reaching out To Microsoft Q&A forum

Based on your description, I understand that you’re encountering the error code AADSTS900561: The endpoint only accepts POST requests. Received a GET request. 

Please try reviewing the guidance provided by Q&A Assist and check whether it helps resolve the problem on your side. 

Moreover, another scenario that could cause this problem is when you sign in to Azure/Entra Portal using your personal account which is not added as an external/guest user to an Azure AD tenant. So, you can read the information in these relevant threads for more insight: https://learn.microsoft.com/en-us/answers/questions/1377925/issue-while-logging-in-to-azure-entra-portal-aadst

Hope my answer will help you, if the problem still persists, kindly let me know in the comments for further support.

Best regards

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The error message you are encountering, AADSTS900561: The endpoint only accepts POST requests. Received a GET request, indicates that the request being made to the endpoint is using the GET method instead of the required POST method. This typically occurs when the client application is incorrectly configured to send the request type.

To resolve this issue, ensure that the request to the endpoint is correctly set up to use the POST method. This may involve checking the code where the request is being made and confirming that the HTTP method is specified as POST.

If you need further assistance, please provide more details about the context in which this error is occurring.