We have an on-prem configuration of SharePoint 2016 and Remote Web to host Addins (also on-prem). Configuration is high-trust. Our SharePoint domain is testab.com. Web Apps (or sites) will use abtest.com as their domain or url. Obviously these domain names are not actual, but should depict what we're trying to do.
Regarding setting up Certificate for SharePoint and Addin server - is it okay to have the cert issued to abtest.com domain even though the SharePoint servers domain is testab.com? If not, what will work - knowing SharePoint domain is what it is and public url needs to be abtest.com?
We are currently getting a Mismatched Address Certificate error.