Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
1
This error is being reported by many people with the Office apps on an Apple Mac device
The best option is to completely uninstall the Office apps from your Mac, then follow the steps at this link to remove the Office license.
Then, restart your Mac and sign in to your Microsoft account online ( https://account.microsoft.com/services/ ) to reinstall the Office apps.
2
If you are still unable to activate Office, what version of Office and the MacOS is installed on your computer.