troubleshooting Question

Migrating G Suite to an an existing Office 365 account

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ptsolutionsincFlag for United States of America asked on
Microsoft 365
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I am in the beginning stages of a G Suite to Office 365 migration. I have an issue that hopefully someone can guide me. The end user already has an existing Office 365 account with other domain names ( I added the current G Suite domain ( so I can start creating the mailboxes but whenever someone from tries to send an email to the email gets rejected. I guess it is because it sees the domain name locally / on the same O365 server and not looking at the DNS records as the MX record is still pointing to their live environment with Google.  Is there a way around this so I can re-add the domain, start creating all the mailboxes and migrate the data?
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