This browser is no longer supported.
Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(64, 71%, 16%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EDT%3C/text%3E%3C/svg%3E)
I am trying to migrate a single mailbox from our on-prem Exchange 2016 to Exchange Online. I did this more then a year ago with success. But now it always fails with error: "Error: NotAcceptedDomainException: You can't use the domain because it's not an accepted domain for your organization.". This error sounds pretty straight forward, but fo rme it isn't.
The problem is that I have verified all Email domains of the user in charge and also the accepted domains from Exchange Online resp. Verified domains from Office Admin Portal.
These are the Email-Adresses for the user
X500:/o=ExchangeLabs/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=c308a8699b5846959d76912ead7af43f-Firstname Lastname
smtp:firstname.lastname@mobileX.intra
smtp:firstname.lastname@mobilexag.net
smtp:firstname.lastname@mobilexag.com
SMTP:firstname.lastname@mobilexag.de
smtp:firstname.lastname@mobileXAG.onmicrosoft.com
X500:/o=DOMAINNAME/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=8b8d193063a848cd9ab0169e8902b6ec-Firstname Lastname
smtp:firstname.lastname@mobileXAG.mail.onmicrosoft.com
And these are the accepted/verified domains.
Name Status Authentication
ext.mobilexag.de Verified Federated
mobilexag.online Verified Managed
mobilexag.de Verified Federated
mobileXAG.onmicrosoft.com Verified Managed
mobileXAG.mail.onmicrosoft.com Verified Managed
mobilexag.net Verified Managed
mobilexag.com Verified Managed
As you can see, all domains excepted mobilex.intra which is our internal DNS domain suffix (that one cannot be added to Office Online), are present. What is then the problem? I have to admin that mobilexag.com and mobilexag.net where not in place in Azure, but I added them afterwards, my migration batch still fails for several times. and I wonder, because my user I did migrate more then a year ago also definitely had an email address @mobilexag.com back then, and migration still went through successfully.
Can you remove that proxy address?
smtp:firstname.lastname@mobileX.intra
and then try again?
Hi, indeed that worked. But is this something new? I can bet that back then when I did my test migrations all of my mailboxes had this @mobilex.intra smtp address. And even now, my mailbox which I migrated quite a while ago still has this address assigned even now, although it is a 365 mailbox.
But indeed, I just double-checked, only the object I check in the on-prem ECP still has a @mobilex.intra address, the same object checked in Online Exchange Admin does not have it.
How can this be, is there an explanation for this?
kind regards,
Dieter
Yea, I cant remember if that worked at one time. This bites me every once in awhile as well and its some old FAX address or something
By searching carefully, I found the solution. The user must be licensed for the migration to occur. See https://learn.microsoft.com/en-us/exchange/troubleshoot/move-or-migrate-mailboxes/issue-with-add-recipientpermission-cmdlet
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(137.6, 37%, 23%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EG%3C/text%3E%3C/svg%3E)
I'm looking for answer to same problem. Thing is that I can migrate user mailboxes having internal email address just fine. But to be able to migrate shared or resource mailbox internal email address must be removed. Still wondering why.