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Exchange 2010 Coexist with Exchange 2016

I have a Exchange 2010 with mailboxes that still have the First Administrators Group Legacy attributes. I have installed Exchange 2016 on a new server all looks well. If I create a mailbox in Exchange 2016 or migrate a mailbox from 2010 to 2016 no mail can be sent to mailboxes outside the domain or on the Exchange 2010 server. I get an error back

421 4.4.2 connection dropped due to socketerror

The Exchange 2016 server cannot connect to the Exchange 2010
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8/22/2022 - Mon