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JustinMicheal-7973 asked KyleXu-MSFT edited

Issue with exchange mailbox

One of our user in another domain is unable to create exchange online mailbox
having Hybrid set up
have AD connect
have NOT yet MIGRATed ALL THE MAILBOXES TO exo
mailbox is on prem
No email routing is done
without having fullfledged attribute sync
user want to create 1 exo mailbox
Is it possible?

office-exchange-online-itprooffice-exchange-server-connectivity
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@JustinMicheal-7973

Haven't received your update about this thread for a long time, any update about it now? Could you create mailbox successfully?
If the suggestion below helps, please be free to accept it as an answer for helping more people.

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KyleXu-MSFT answered

@JustinMicheal-7973

One of our user in another domain is unable to create exchange online mailbox

Do you mean that you cannot create Exchange online mailbox which use that domain as the suffix of the email address?

If you want to use an additional email address on Microsoft 365/Exchange online, you need to have the ownership of this domain first, then you need to verify this domain name on Microsoft 365 admin center.

After that, you will could use this domain to create mailbox on Exchange online.


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