I Would like to prohibit private chat only for Guest user.
Because Teams can't archive private chat between guest users on Group mailbox.
Is there anyway to disable it?
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In the Office 365 Admin, Go to Settings > Services & Add-ins > Microsoft Teams.
Then, change your License Type to "Guest". And then disable the chat option.
Thank you for your reply.
I under stood how to configure it.
I didn't imagine that license type change effect to message settings.