Additional features, settings, or issues not covered by specific Microsoft Teams categories
I've got the same problem, it seems to work if all windows are on the same 'desktop' when sharing (no full screen). I also added Teams to the Files & Folders, Full Disk Access & Screen Recording areas in settings & toggled all of these multiple times & it started working (no idea why in particular). Too flaky to rely on for any business use however, so effectively useless!! PLEASE SORT THIS ASAP!!
Also I would like to add that Teams is SO UNINTUITIVE to use and has AWFUL MULTI-MONITOR SUPPORT - I want to see team members on one screen and the presentation (whether mine or others) on the second screen. I would use a different app in a heartbeat if it wasn't for my organisation. We all hate this app!!!