Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
1
Please provide a screenshot of the error you see when you try to log into the Office apps.
2
Log into your Microsoft account on this link, is your Office licence listed correctly there, or if that is a subscription, check the expiry date listed on your subscription, is that listed correctly.
https://account.microsoft.com/services/
If not, go to the Payments and Billing section, is it indicated your payment has been processed correctly.