Send to a domain in the same O365 account

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I am moving a GSuite domain to an existing O365 account and want the 2 domains to be able to send mail back and forth. However when I move the domain into the account the 2 domains cant send to one another, I get a domain cant be recognized message. They get email from every other domain just not each other. I am sure I am missing something simple, any help would be appreciated. Thank you.

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