Exchange Online: You can’t use the domain because it’s not an accepted domain for your organization

One of the gotchas you may encounter when migrating mailboxes to Exchange Online is none registered Accepted Domains in Exchange Online. For example you may encounter the below error;

ERROR: Migration Permanent Exception: You can’t use the domain because it’s not an accepted domain for your organization –> You can’t use the domain because it’s not an accepted domain for your organization.

This maybe due to an email alias on a particular mailbox or all your organisation mailboxes due to an Email Address Policy. When migration to Exchange Online on you need to register all your accepted domains and remove any that may cause you the above issue.

In my case, I had domain.com registered with EXO but not extension.domain.com, as the alias was a legacy address you could be removed from the mailbox either using the Exchange Management Console or my favourite utility PowerShell.

Please ensure that Azure Active Directory has synchronize this change to your mailbox

Set-Mailbox <identity> -EmailAddresses @{remove=”<E-mail address>”}

Regards

The Author – Blogabout.Cloud


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