My Outlook clients on the domain are not connecting to the new Exchange Server 2016 post migration from SBS 2011.
I followed the migration guide and experienced very little issues but managed to fix whatever came around.
My problem is the following:
EXTERNAL (MOBILE and LAPTOPS) outside of the network can connect to Outlook anywhere.
On the internal network, the "old" SBS clients do not connect when they are on the domain. Outlook just states disconnected and fails to connect at all.
If I setup a new profile, then I receive the dreaded "something went wrong with setting up your account" message.
Mail in and out flows with-out an issue
I did receive errors with autodisovery which I fixed using the Outlook Anywher and SOAP guide on Server-essentials.
Could this be because I did not finish the ARRCONFIG seciton of the migration?
Clients are running WINDOWS 10; OUTLOOK 365/2019
Server: WINDOWS 2016 with EXCHANGE 2016
Please assist if you can