The Misleading Teams Remove External Chat from User View API
The Graph removeAllAccessForUser API is supposed to remove external chat messages from the view of a tenant user when the chat contains some objectionable material. Unless the documentation is erroneous, the API doesn’t work as advertised and the results are disappointing. All of which means that blocking content for external chats isn’t really possible. If someone gets to start an external chat, they can pump some horrible stuff into your tenant.