Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Log into any Microsoft account you may have on this link, are you able to find the Microsoft 365 subscription and if so check the expiry date listed on your subscription, is that listed correctly.
https://account.microsoft.com/services/
Click the Billing icon on the left, do you find your subscription listed there and if so, is it indicated your payment has been processed correctly.
If you are unable to find the subscription or payment details on any Microsoft account you may have, did you pay Microsoft directly for the subscription or pay through the Apple App Store or Google App Store.