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Set up mail flow: "This domain already exists"

Hello,

we are just testing the Sophos Email feature in Sophos cloud.

We have a complete new environment in Sophos, but already synchronized the users from EntraID.

We want to implement the M365 Mail flow / connector way and not the Gateway.

But when we come to the "Add Domain" window it always says that our domain already exists:



Added TAGs
[edited by: Raphael Alganes at 2:05 PM (GMT -8) on 14 Jan 2025]