When sharing documents via screen share colours in the document appear desaturated or muted.
I work for a graphic design agency so it's really important that colour in documents is reflected as accurately as possible* when sharing screen. If we're presenting a red logo and the client sees it as pink that's not help.

I attach a screenshot demonstrating the difference. The left-hand shows the Keynote file open on my desktop, the right-hand side shows the exact same document viewed through Teams.

*Obviously every screen displays colour differently and this also depends on user settings, but it would be helpful if Teams didn't complicate this further.