problem logging in microsoft 365 account on Mac

Sophathonin Chea 0 Reputation points
2026-08-18T05:11:36.7166667+00:00

i have a new account. Once i click on sign in, it's loading nonstop and showing blank.

Microsoft 365 and Office | Install, redeem, activate | For education | MacOS
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  1. AI answer

    2026-08-18T05:11:51.96+00:00

    On Mac, a nonstop blank Sign in window is commonly caused by stuck Office credentials or cached authentication data.

    Try this in order:

    1. Quit all Microsoft 365 apps Close Word, Excel, PowerPoint, Outlook, and any other Office apps.
    2. Clear saved Office credentials in Keychain Access
      • Open Keychain Access.
      • Search for Office and Microsoft.
      • Remove related Office/Microsoft credential items.
      • Restart the Mac.
      • Open an Office app and try signing in again.
    3. If Office keeps asking to sign in or shows authentication problems If the apps were moved from the default /Applications folder, Office can repeatedly ask for sign-in or show Authentication Expired. In that case, reset keychain permissions using the guidance in Microsoft 365 or Office for Mac repeatedly requesting keychain access.
    4. Run the Mac license removal tool if the issue continues Use the official Mac license removal tool, then restart the Mac and sign in again with the new account. This clears saved activation and licensing data on the Mac. It does not remove the Microsoft 365 purchase, but sign-in is required again afterward.
    5. Confirm the account can sign in on the web Go to Microsoft 365 on the web and verify the new account can sign in there. If web sign-in works but Mac apps still show the blank loading screen, the issue is more likely local cached credentials on the Mac.
    6. If still blocked, use Microsoft’s sign-in helper Microsoft recommends the Sign-in helper to identify Microsoft account sign-in problems.

    Important: Microsoft support agents cannot send password reset links or access and change account details.

    AI-generated content may be incorrect. Read our transparency notes for more information.

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  2. Ana Le 2,345 Reputation points Independent Advisor
    2026-08-18T05:25:08.4433333+00:00

    Hi,

    As AI's forum recommends, I suggest first checking whether the new account can sign in successfully to Microsoft 365 on the web. This helps determine whether the issue is specific to the Mac/Office apps or affects the account itself.

    If the account can sign in on the web, please try the following:

    1. Make sure all Microsoft 365 apps are closed, restart the Mac, and try signing in again from Word or another Office app.
    2. Make sure Microsoft 365/Office is updated to the latest available version.
    3. If the sign-in window is still blank or keeps loading, follow Microsoft's troubleshooting steps for Office activation on Mac. These steps include checking and resetting Office credentials stored in macOS Keychain when required: What to try if you can't install or activate Office for Mac | Microsoft Support
    4. If the issue continues after the above steps, Microsoft's Office license removal tool can be used to remove the existing Office license information from the Mac and then activate Office again with the new account: How to remove Office license files on a Mac | Microsoft Support

    Please also provide the following information if the issue persists:

    • macOS version
    • Microsoft 365/Office version and build
    • Which Office application shows the blank sign-in window
    • Whether the new account can sign in successfully on the Microsoft 365 website

    This will help narrow down whether the problem is related to the account or the local Office installation.

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