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Migrating mailbox over Exchange Hybrid deployment failing - "not an accepted domain"

I'm having problems moving a mailbox from an on premise Exchange 2013 server to Exchange Online. Here are the steps I go through -

Sign in to Exchange Online admin
Recipients > Migration
Add > Migrate to Exchange Online
Select Remote move migration
Select a test user
Select a migration endpoint
Confirm endpoint, which is showing mail.domainname.com
Give it a batch name,
a target deliver domain, which is companyname.mail.onmicrosoft.com
Automatically start

It takes 7 minutes to go from "synching" to "failed". The report is below -

"Error: MigrationPermanentException: 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."

Has anyone experienced this error?

Adam Brown

Check the email addresses for each of your mailboxes to see what the Default (or Reply To) email address is set for. If that email address's domain is not added to Office 365, the migration will fail. If it is set to by domain.local or something similar, you'll need to change the default email addresses to match the domains you have added to Office 365.

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Jason Oldershaw

ASKER

UPN was the ticket, thanks.

Also, it's worth waiting for AD sync to have completed a sync before attempting a new migration after sorting UPN.

Migrating mailbox over Exchange Hybrid deployment failing - &quot;not an accepted domain&quot;

Migrating mailbox over Exchange Hybrid deployment failing - "not an accepted domain"