Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Uninstall your current Office apps:
Uninstall all Office apps completely
Open Finder > Applications
Select all Microsoft Office apps (Word, Excel, PowerPoint, Outlook, OneNote, etc.)
Download and install through your Microsoft account:
Go to account.microsoft.com/services
Sign in with the Microsoft account linked to your subscription
Find your Microsoft 365 subscription and click Install
Once installed, open any Office app and sign in with the same Microsoft account to activate.
If you purchased your subscription via the App Store, try downloading it through the App Store.
Also install the latest version of the Microsoft AutoUpdate app. There is a link in the support article at https://support.microsoft.com/en-us/office/lifecycle/officeinstall/update-office-for-mac-automatically
If the problem persists, please let me know.