Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
1
Open Word.
Go to File - Account.
On that window, you should see the Email address used for your Microsoft 365 subscription, note it down.
Log into that Microsoft account on this link and check the expiry date on your subscription, is it listed correctly for your recent subscription payment.
https://account.microsoft.com/services/
2
If the expiry date is listed correctly on your account online, where are you seeing the notifications to make a payment, is that inside one of the Office apps or are you receiving an Email to make the payment.