I have 1 on Prem Exchange 2013 servers and I'm trying to migrate to Exchange 2016. I moved my mailbox to one of the new servers and now I get a certificate warning only when I connect to exchange using Outlook connected to the corporate network. All of the internal uri's are pointing to the internet fqdn. The SAN cert is complaining that the local exchange server isn't in the SAN cert which it isn't. This works no problem for the Exchange 2013 server. Is there another setting I'm missing? Thanks in advance.