ABP based GAL segregation not working on Mac clients over EWS

[Blizzisme]

#167376

We need to segregate different parts of the organization. I know abps don’t work for Mac clients if they are in the same domain, so we created a dedicated domain for our mail outside our office(colocated at a data center).

Set up the domain.
Set up exchange
Set up all the mailboxes
Set up all the abps.

Tested from Windows clients -> everything works
Tested from Mac clients, including home machines with no access even to our internal domain -> they ignore the abps

Verified they are connecting to ews
Verified abps and about routing agent are set up and working properly.
Verified none of the exchange servers are GCs.

What else should I be checking, or what else could be relevant to this?

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