dynamics online: change the @domain.onmicrosoftonline.com to @customdomain.com?

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Have a client that set up Dynamics 365 using the default .onmicrosoftonline.com tenant address. They just migrated their email from a third party imap provider to office 365. new User accounts were created for the imap migration and all users@customdomain.com have mailboxes. The dynamics online accounts did not have mailboxes to begin with.

I tried going to the user@domain.onmicrosoftonline.com account in office 365 and changing the user name field to user@customdomain.com but i get an error stating /The email address is being used by user @customdomain.com. Please use a different email address/

Any ideas or are they stuck with using the user@domain.onmicrosoftonline.com address?

Thanks in advance and apologies if asked and answered before.