Mar 16 2018 07:30 AM
Hi,
We have multiple domains in a single Office 365 tenant:
Whenever, I create a shared mailbox or user in a secondary domain, it automatically creates a username/alias with PrimaryDomain.com.
Examples of the issue (current):
What we want:
How can this issue be resolved?
Thanks,
Mar 16 2018 11:55 AM
Is the primary the tenant.onmicrosoft.com one? If so, the issue is due to the default Email Address Policy in ExO, which stamps @tenant.onmicrosoft.com to each object. You cannot modify that policy, however you can change the default domain.
Mar 16 2018 04:51 PM
Mar 21 2023 08:58 AM - edited Mar 21 2023 09:01 AM
I am having the same issue.
Here is my solution to fix it.
1. Create new Shared Inbox name @ domain2.com
(this will wrongly create a user and a shared inbox alias of name @ domain.com)
2. Go to Users - Active Users and find name @ domain.com - edit the user and change the username to name @ domain2.com
3. Go back to the Shared Inbox and delete the Alias.
Oct 24 2023 10:29 AM - edited Oct 24 2023 12:51 PM
I just ran across this today.... FIVE YEARS AFTER YOUR POST. lol
It's absolutely bizarre.
So if you setup a shared mailbox using sharedgroup @ any domain attached to the account, an alias is automatically setup for sharedgroup @ primary domain.
Once this is done, you can no longer setup anything else with sharedgroup @ on ANY domain no matter how many you have as they all create this mystery alias in the background and fail because it's already created elsewhere.
If you add an additional alias it will allow you to delete the @primarydomain as an alias....you think you've solved it. But when you visit again you'll see that it's returned.
The fix mentioned above no longer works. Apparently MS "fixed" that and it no longer works. It reappears after you save just as if you didn't do anything at all.
Anyways, although the error says so, the problem is not because the domain being setup is in use elsewhere, it's because your boxname@ is in use by your primary domain.
If you have multiple domains you can normally duplicate users for each domain. But not on a shared mailbox. Once you do, regardless of the domain it's setup on, that username can no longer be used across all of the domains in the account.
Feb 23 2024 07:59 AM
Feb 23 2024 08:02 AM
Feb 23 2024 08:07 AM