copilot : unknown hard error

Hi 재성 김,

Please follow the steps below to help resolve the issue:

Check for Updates Make sure your Office app is up to date. Install any available updates.

1. Restart and Sign in Again Close the Office app completely, then reopen it and sign in with your account.
2. Make sure you are quitting all the office applications from the hidden icons as well Clear Office Cache Follow the instructions in this Microsoft Support article to delete your Office Document Cache: Delete your Office Document Cache - Microsoft Support Delete your Office Document Cache - Microsoft Support