Thank you for your feedback. The team is currently planning for a profile editing experience for Guests that will include changing profile images as well as updating display names. We will share an update as soon as one is available.
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We use Teams for online tutorials, we are supposed to require our students to use their real name as display name for us to recognize them. Unfortunately, there is no way for them to do it. We are willing to do it ourselves, to edit the display name of our 3000 students, sounds like a stupid idea to do manual, but the platform offer us no recourse. Unfortunately, the most frustrating part come, even the Global Admin has no ability to do that. We tried to edit the display name in Azure, but still, the display name in Azure won't reflect to Teams.