Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
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 subscription then recognized correctly and does that remove the notification.
2
If not, log into your Microsoft account on this link, check the expiry date listed on your subscription, is that listed correctly.
https://account.microsoft.com/services/
If not, go to the Billing section, is it indicated your payment has been processed correctly.