I purchased an MS Office 2021 key because my previous version of office (key bought elsewhere) had stopped working after a Windows 11 update (24H2). It had worked since 2020 but with the issue created I decided to buy a newer version than I had.
The purchase went smoothly and I received my key very quickly. However I discovered the issue created by the Windows update was not rectified by a newer product but customer support guided me through how to sort the issue in very quick time. It seems the issue created by Windows is highlighted on microsoft's support pages. I had to edit regedit and I was guided to how to do this by customer support. So I now have a working key/product which so far I am happy with.