MS Teams - Check Spelling
Desktop:
Teams underlines spelling errors in red as you type. Right-click the error to see a list of suggested corrections.
Currently, you can't run a separate spelling and grammar check in Teams (unless you're working in your Wiki tab).
Mobile:
Teams underlines spelling errors in red as you type. Tap the misspelled word to see some suggested corrections. Currently, you can't run a separate spelling and grammar check in Teams.