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Infpk-4478 avatar image
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Infpk-4478 asked Infpk-4478 answered

Inter tenant collaboration

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?

office-outlook-itprooffice-exchange-hybrid-itpro
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Hello @Infpk-4478,

Thanks for reaching out.

Could you please elaborate in detail, are you referring to windows Active Directory services? or Azure AD Tenant? and when you say separated 2 domains , do you mean users were part of same Azure AD tenant earlier and moved to new tenant? or there were two custom domain which was part of same Azure AD tenant and one of them removed recently?

Thanks in advance and We are here to help.

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Deleting this response. it was mistyped

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Thanks for the update. This seems to be more related with Windows Active Directory and Outlook. Therefore, adding right tags to get expertise. Thanks.

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KaelYao-MSFT avatar image
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KaelYao-MSFT answered KaelYao-MSFT commented

Hi @Infpk-4478

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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Hi @Infpk-4478

I am writing here to confirm with you how thing going now?
If you have any questions or needed further help on this issue, please feel free to post back.

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No, I believe the question has been misunderstood.

There exists 2 different domains.

ABC.com and XYZ.com

User@abc.com should be able to look up organization details of user@xyz.com

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Sorry I still don't understand your question.

In the main post, your question is how to find users or look up their organization details from the other domain.
But in your reply to sikumars, you mentioned you would like to "correct this mistake and have users be able to enter username@upn-2.com to access email and applications".

To me these two questions aren't relevant, and since in our forum we suggest only asking one question per thread, I would suggest that we focus on the first one in this thread.
Thanks for your understanding.

User@abc.com should be able to look up organization details of user@xyz.com

Do you have Exchange on-premises servers and would like to change the information of users in another domain in Outlook?

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Infpk-4478 avatar image
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Infpk-4478 answered

Yes, using office 365.

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