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How to fix AADSTS900561 error when signing in

SPOADMIN 35 Reputation points
2024-09-02T08:36:33.42+00:00

I am having trouble signing in and receive an AADSTS900561 error stating "The endpoint only accepts POST requests. Received a GET request." How can I fix this issue?

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Microsoft Security | Microsoft Entra | Microsoft Entra ID

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  1. Abiola Akinbade 29,490 Reputation points Volunteer Moderator
    2024-09-02T09:10:03.56+00:00

    You need to add https://login.microsoftonline.com and sso and to your list of trusted sites.

    To do this:

    1. On your computer, open Chrome
    2. At the top right, click "More" and then "Settings."
    3. Click "Privacy and security" and then "Site Settings."
    4. Click "Additional content settings" and then "Insecure content."
    5. Next to "Not allowed to show insecure content," click "Add."

    From here you just need to add these two sites:

    You can mark it 'Accept Answer' and 'Upvote' if this helped you

    Regards,

    Abiola

    2 people found this answer helpful.
  2. Sandeep G-MSFT 20,911 Reputation points Microsoft Employee Moderator
    2024-09-03T09:09:21.54+00:00

    @SPOADMIN

    Thank you for posting this in Microsoft Q&A.

    If you are using Chrome, you may need to add , you may need to add https://login.microsoftonline.com to your list of trusted sites.

    In Chrome, go to:

    Copy

          Settings – Advanced – Content Settings  
      Cookies – Allow – ADD – “login.microsoftonline.com”  
     Unsandboxed plugin access – Allow – ADD – “login.microsoftonline.com”

    You may also need to add "https://autologon.microsoftazuread-sso.com/"

    In addition, if you haven't done so already, you should go to Chrome > Settings > Cookies and other data and unselect "Block third party cookies".

    224535-image.png

    If none of these steps work, you can go to the nuclear option and clear your cache and get rid of all cookies. While killing the browser cache can be inconvenient, it is one way to resolve this issue.

    If none of these options work, feel free to reach out to me and I will be happy to continue troubleshooting over email or by opening a support case.

    Please "Accept the answer" if the information helped you. This will help us and others in the community as well.

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