Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
1
Please provide full details on the error you see when you try to use the Office apps on your MacAir is that a popup dialog with an 0x0 error.
2
At the top left of your Mac desktop, click the Apple icon and select 'About this Mac', what version of MacOS is installed on your computer?
3
Log into your Microsoft account on this link, check the expiry date on your Microsoft 365 subscription, is that listed correctly?