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The Customer Connection signup page is broken, or I'd have put this there. (The required "Country" dropdown has no entries and the form won't submit without it. This is on Chrome) The consensus from my user community so far is that they don't like it...
As Udupi said, you can request a private listener from TAC. I would make an additional suggestion, that you add an outbound content filter to check that outbound email for your M365 tenant ID. Cisco's documentation suggests adding a transport rule to...