NewMicrosoft Teams
Microsoft Teams: Impersonation Protection for Teams meetings
Teams will automatically surface impersonation warnings and risk indicators for suspicious participant identities in meetings. This is a security feature with no required admin action at launch.
Microsoft's description
Impersonation Protection for Teams meetings helps users identify potentially deceptive participants and meeting organizers. When Teams detects a potential impersonation attempt, it surfaces warnings and risk indicators to help users recognize suspicious identities and make more informed decisions when joining or participating in a meeting.