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Migration from Exchange 2013 with Sophos Gateway to Exchange Online with Sophos Mailflow

We are currently migrating from Exchange 2013 with Sophos Gateway to Exchange Online with Sophos Mailflow but unclear how to proceed. I've requested support a number of times but they keep pointing to a document that that outlines the move M365 Gateway to M365 Mailflow which isn't what I'm doing.

I really need a step by step guide on how to go about this an timing. I've completed a 90% data migration of all mailboxes so would the Sophos move take place now or after a complete migration, where would this leave the on-site server if moved now?

The first stage of the setup asks the question am I copying the M365 domain or setting up domain manually, I'm assuming manually as I assume exiting means I'm already using the gateway product for M365? Any pointer would be helpful.



Edited tags
[edited by: Raphael Alganes at 5:54 AM (GMT -7) on 7 Jun 2023]