Trouble signing in on Mac laptop

Michelle Evans 0 Reputation points
2026-02-26T01:35:31.5466667+00:00

I am having a problem signing into my Microsoft office 365 account on my Mac laptop computer

Microsoft 365 and Office | Word | For home | MacOS

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  1. John Jefferson Doyon 90,560 Reputation points Independent Advisor
    2026-02-26T02:13:47.0133333+00:00

    Hi, I'm John! I will help you with this.

    To help narrow down the issue:

    1. Do you get an error message? If yes, what does it say exactly?
    2. Is it happening in all Office apps (Word, Excel, etc.) or just one?

    In the meantime, if you haven’t already:

    You can try these quick steps in the meantime:

    • Fully close all Office apps (Word, Excel, Outlook).
    • Restart your Mac.
    • Open one Office app only (for example Word) and try signing in again.

    If it still won’t sign in:

    • Open Safari and sign in at https://account.microsoft.com
    • Does it sign in there without issues?
    • Make sure your Mac date and time are set automatically (System Settings > General > Date & Time).

    If the issue persists, please provide more details by answering my questions.

    Click "Add comment" below to let me know.

    Regards,

    John J.D.

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  2. AI answer

    2026-02-26T01:35:42.18+00:00

    Try these steps on the Mac to resolve common Microsoft 365 sign-in issues for Office apps such as Word:

    1. Confirm basic sign-in path
    • Open Word (or another Office app).
    • If prompted, select Sign In.
    • Enter the email address and password used with Microsoft 365 (either a personal Microsoft account or a work/school account), as described in the standard sign-in steps for macOS.
    1. Fix “another account is already signed in” errors If the message appears:

    Sorry, another account from your organization is already signed in on this computer

    Follow these steps for Mac:

    1. Close all Microsoft 365/Office apps.
    2. Open Terminal (Applications > Utilities > Terminal).
    3. Run this command: 
         defaults write com.microsoft.Word ResetOneAuthCreds -bool YES
    4. Open Word again and complete the sign-in/activation prompts.
    5. If the issue persists, clear old Office credentials from Keychain:
      • Open Keychain Access (Applications > Utilities).
      • In the search box, type Office.
      • Delete all entries that contain “Office” (typically 2–6 items).
      • Close Keychain Access and try signing in to Word again.
    6. Fix repeated keychain/credential problems If Office keeps asking for keychain access or sign-in:
    • Make sure Office apps are installed in the default /Applications folder.
    • If sign-in issues continue, remove Office license files as described in the Mac activation troubleshooting article, then restart an Office app and sign in again.
    1. If sign-in still fails
    • If this is a work or school subscription and sign-in still does not work, contact the Microsoft 365 admin for the account to verify the subscription and account status.

    References:

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