During Teams meetings the view you see of your own webcam appears back to front (don’t worry everyone else sees it correctly). If like Rob your background includes text or logos this can be confusing to look at with everything backwards 
A new feature for the Teams desktop app allows you to fix this so that the webcam preview you see during meetings is the correct way round. During a meeting at the top-right corner of the meeting window, click … More, Device Settings, then Mirror my video.
