Microsoft Office Requires Subscription

If you use Microsoft's 365 apps from the Mac App Store, then they absolutely require a subscription to use their full features. They aren't free.

Did you recently download the apps from the Mac App store or have you recently cancelled a subscription form Microsoft directly?

Microsoft Offers the one time purchase Microsoft Office 2021 that can be used without a subscription, but you still need to buy it once.

https://www.microsoft.com/en-us/microsoft-365/buy/compare-all-microsoft-365-products

I suggest contacting Microsoft for an answer to that question.

Apple Support Communities isn't the best place to find answers for Microsoft products, however, I am reasonably certain Microsoft expects you to pay for the continued privilege of using your documents, spreadsheets, and presentations. That's nothing new, and one of several reasons I abandoned Microsoft nearly two decades ago. There are plenty of alternatives to their overpriced bloatware today.

Consider Apple's Pages, Numbers, and Keynote. They are free and can read / write their M$ equivalents. If they do not meet your needs, NeoOffice and LibreOffice are also free or nearly so (respectively). Search the App Store.