Conversations involving multiple participants, allowing collaboration and information sharing in Teams
For about a week mine was working great again, now it doesn't even detect a word is misspelled.
I had the same issue and tried it all. After talking with my Teams admin, we were able to get this resolved by closing teams and then removing the contents in: %localappdata%\Packages\MSTeams_8wekyb3d8bbwe\LocalCache\Microsoft\MSTeams
After we removed it and started teams, it is now detecting misspelled words.