We have also come to the conclusion it is the version of MS Office.
When we install an old office version (for example 2302) and disable office updates it works. Our main issue however, is that office eventually updates itself despite our company wide policy to disable office updates. We assume this is updating via Teams updates (which is not currently disabled).
We cannot expect to keep rolling back Office versions however as a work around. Please can anyone comment if they have engaged MS directly via support?