Recently we separated 2 domains and now we are unable to find users or look up their organization details from the other domain?
How can I fix this issue?
I would like to confirm with you first:
Do you have an Exchange on-premises server?
If so, did you mean:
1.You have two separate AD domains, let's say domain-A and domain-B, and also a domain used for users to login Outlook from internet, let's say domain-C
2.When domain-a users log in their computer, they use domain-A\username.
When they log in Outlook from internal, they need to use domain-B\username
3.And when users log in Outlook from external, they need to use domain-C\username
4.You would like to have internet users use domain-B\username to log in Outlook (currently they are using domain-C\username)
If I misunderstood it, please feel free to correct me.
If it is the case, I suppose domain-C is your mail domain, which has DNS records in the public DNS.
If you would like to have internet users use domain-B\username instead, you may need to own this domain first and setup the corresponding DNS records in public DNS.
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Yes, using office 365.
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