can't log into Microsoft word

If the subscription is paid, the fastest supported checks are:

1. Verify the correct account is being used.
   • Sign out of Word, then sign in again with the Microsoft account that owns the subscription.
   • Check https://account.microsoft.com/services and confirm the Microsoft 365 subscription appears there. If it does not appear, that account cannot activate Word.
   • If needed, try other personal email addresses, or a work/school account if that is how the subscription was assigned.
2. Check subscription and payment status.
   • Close all Office apps.
   • On Services & subscriptions, confirm the subscription is active.
   • On Payment options, update the payment method if it shows an error.
3. If this is on Windows, run the Microsoft 365 activation troubleshooter.
   • Run it on the same Windows PC that has Microsoft 365 installed.
   • Windows 10 or later is required.
   • Follow the prompts in Get Help to repair activation.
4. If this is on Mac, update Office first.
   • Close all Office apps.
   • Open Finder > Applications > Microsoft AutoUpdate.
   • Install all available Office updates, then open Word again and test activation.
   • For the known 0x0 / License not found issue on macOS, Microsoft’s resolved guidance is to update Office and ensure macOS is version 12 or later.
5. If activation still fails, check for conflicting Office installs.
   • On Windows, open Control Panel > Programs > Programs and Features.
   • Search for office.
   • If more than one Office version is installed, uninstall the version not being used, restart the PC, and try activation again.
6. Last resort: reinstall Office.
   • Deactivate the current install.
   • Completely uninstall Office using the easy fix tool.
   • Reinstall Office.
   • Warning: uninstalling and reinstalling changes the local Office installation, so save work first before proceeding.

If this is a Mac and the error is specifically 0x0, updating through Microsoft AutoUpdate is the most relevant first step.

References:

• Unlicensed Product and activation errors in Office | Microsoft Support
• Office error "Account Notice: We've run into a problem with your Microsoft 365 subscription" | Microsoft Support
• Unknown Error 0x0 or License not found error in Microsoft 365 or Office running on macOS | Microsoft Support