I think you will need to contact Microsoft about that: Contact a third-party vendor - Apple Support, but from what I have read on this site attempting to talk sense into them will only result in frustration and wasted time.
I suggest you do this instead. Open that document using any number of free programs such as Apple's Pages or third party products such as LibreOffice:
https://apps.apple.com/us/app/pages/id409201541?mt=12
https://www.libreoffice.org/
Those are just two examples. There are others. They are capable of reading, editing, and saving Microsoft Word formatted documents and Excel spreadsheets.
I gave up on Microsoft years ago, when they made continued use of their products too inconvenient. Fortunately no one needs Microsoft any more.