A family of Microsoft word processing software products for creating web, email, and print documents.
1
Open Word.
At the top right of Word, log out of Office.
Restart (not shut down) your PC, then log back into Office, is your licence/subscription then recognized correctly.
2
If that does not resolve the problem, open Word.
Go to File - Account, click the 'Update Licence' button to test if that resolves the problem.
3
If not, 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, what Office licence or subscription do you have linked to your Microsoft account.