changing the namespace in a DAG clúster

Hello everyone.
I currently have a 2 server Exchange 2019 DAG configured with File Share Witness in my LAN and a Load Balancer in the DMZ.
Currently everything is configured and working fine, although I don't have it in production yet.
I want to change the namespace from mail.contoso.com to mail.fabrikam.com , which includes changing all the URLs for both internal and external services.

My question is, is there anything I need to take into account when making this change? Do I just change the URLs or do I need to do something else on the Exchange servers?

Thank you very much in advance.
Regards

Gabriel