Office 365 keeps automatically removing user from Teams Group
Issue
A user keeps being removed from Office 365 Teams Group for no apparent reason. The group admin keeps re-adding the user, but within 12-48 hours the user disappears from the group members list again.
Azure Audit Logs show the user being removed but without any explanation of why this happened.

Activity Type: Remove member from group
Category Type: GroupMembership
Status: Success
Type: Application
Display Name: Microsoft Teams Services
User-Agent: SkypeSpaces/1.0a$*+
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