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Office 365 change login from onmicrosoft.com to domain.com

I am setting up a client on Office 365. I'm doing the express migration.  All the accounts have sync’d.

I started migrating a couple of accounts and the migration works. Their mailbox is created and they have all their aliases assigned to their account.
The problem is the login user name is username@domaincom.onmicrosoft.com and I can’t change it.

Their primary SMTP address is user@domain.com. It shows this is the primary address on-prem and when I look at their mailboxes in Exchange Admin Center online.
I need to figure out how to get this to change so their primary email address is also their login address before I can migrate any more users.
ExchangeMicrosoft 365

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Saif Shaikh

8/22/2022 - Mon