Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
The 0x0 error is being reported by many people with the Office apps on an Apple Mac device, if you do have MacOS Tahoe installed on your PC, this may be caused by a server-side problem, because the July update should only affect Mac devices with older versions of Office or an older version of MacOS.
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.