Remove only one of our domains from Skype on-prem?

[Steve Berkholz]

One of our divisions is migrated 100% to Teams.   All their new hires have to go through the Lync 2013 setup first, then be migrated because of hybrid.

Is it possible to disconnect just one SIP domain from Hybrid at a time?

All of the docs are written as if you only have one SIP domain.

I know for federation, I could just change their their SRV record.

My biggest concern is breaking intra-division communication.

Note:  All of the divisions are in the same topology, but users are/were hosted in different servers based on SIP Domain.

[#2]

Hi @Steve Berkholz, currently Microsoft does not support it to have a mismatch between configured OnPrem SIP domains and the SfB Online/Teams SIP domains. The domains in your OnPrem topology should match to the ones in SfB Online.

If not, the communication between OnPrem and SfB Online users will be interrupted. 

Best regards,

Thorsten