Hi @switzerland ,
Based on my understanding and test, you can add the additional authoritative domain on either side.
As is mentioned in this document, accepted domains can be added using either EAC or EMS. From the user interface in EAC, there isn't any option to choose a certain server. And when it comes to the New-AcceptedDomain cmdlet, according to this article, the cmdlet doesn't have a parameter to specify a particular server. So when a new accepted domain is created, it's actually added for the entire organization:
I've also tested in my coexistence lab and noticed that, no matter where I added the accepted domain, the new created domain can be seen and managed from both sides, for example:
- A new accepted domain is created from the EAC for Exchange 2016:
- Check the EMC on Exchange 2010 and can see and edit the new created accepted domain:
- And vice versa, if the new accepted domain in created from Exchange 2010 EMC, it can be seen and managed from Exchange 2016 as well:
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