How to reflect new Exchange Auth Certificate from 2016 DAG to 2019 DAG in same domain

Question

We are doing migration from 2016 dag to 2019 dag in same domain but in different sites, we are started migrating the mailboxes, but as noticed now Exchange Auth Certificate is about to expire.

So the question is if we renew Auth Certficate at 2016 ( since mail flow is still from 2016 as migration is going on) and publish, so will it be replicated at 2019 dag Client access servers as well? If not then what should we do either export or import or any work around?

Thanks

Answer 1

Yes, it will be replicated to all servers:

https://learn.microsoft.com/en-us/exchange/plan-and-deploy/integration-with-sharepoint-and-skype/maintain-oauth-certificate?view=exchserver-2019

If you wanted to do it manually, you could by exporting and reimporting the cert, but not necessary: