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Teams Messages showing up as Malware
For the last few days every single email my users have gotten that says "So-and-so sent you a Teams Message" (sent from noreply@email.teams.microsoft.com) has gotten flagged as "Email messages contai...
Was a regression introduced in a recent rule update, they have since resolved it. Details are in EX189242 on your SHD. If you are still seeing messages being ZAPed, make sure to open a support case and report it.
From what you explained it could be false positive and I suggest check this with support team. Also check and see if there was any malicious files associated with your posts?