I have a user who is using an iPhone X and is trying to connect to exchange via the apple mail app but keeps getting the error message "Cannot get mail the connection to the server failed."
I know the information is correct that I am entering to the exchange profile within the phone, I have test on an iPhone 8Plus and had no issue connecting to the mail box on multiple occasions. In the Exchange Admin Center for Exchange 2013 I only see a total of 3 devices under mobile devices, the users iPhone X, My phone and an iPad that is working fine, so I know I am below the ten device max connection.
I have disabled FaceID incase that was causing an issue with the passcode minimum, still unable to login.
The phone is using IOS 11.3.1
Exchange Server is Exchange 2013