Hi,
I am also having an issue with Teams running on a brand new 27inch Apple iMac running MacOS Catalina 10.15.7
I have been through all the fixes in this forum post and no luck, Teams will not share the screen unless I uninstall and re-install the Teams application, then it will work for one chat/video call and then will stop working after that. It is not really reliable.
It only seems allow you to share power point files, even if you browse the computer all other file extensions are greyed out even PDFs.
Does anybody have any ideas how to fix this? or when it will be fixed by Microsoft, or anything else I can try. I am running out of options and I am tempted to re-wipe the mac and only run Teams to see if this fixes the issue.
Other users running Catalina 10.15.7 don't seem to have this issue :-(.
Many thanks,