Allow guests to change avatar and description
It doesn't seem like a guests can change their avatar or information such as job title or location. When you have a lot of guests in your team having a picture and job title would be very useful.
Seems like they can't even see avatars https://microsoftteams.uservoice.com/forums/555103-public/suggestions/35537563-allow-guests-to-see-avatars
Mike DePouw commented