I have a customer that wants to access there email via outlook 2016 from anywhere. We have there company's exchange all set up. They have a GoDaddy certificate for autodiscover etc. When we do the test in https://testconnectivity.microsoft.com/ it works successfully. But when trying to connect to there exchange server in outlook it does not let me. I try connecting but i get the following message - " log into exchange activesync mail server (eas) could not locate the specified server".
Any ideas? have I missed something?