Problem setting up a Microsoft Exchange email on LG G4

[AC Question]

Hello, on trying to add a microsoft exchange email I get the following error:

Certificate subject and hostname mismatch
Subject: *.enter-system.com
Issuer: Go Daddy Secure Certificate Authority - G2
Valid from: אוק' 22, 2015
Expires on: אוק' 26, 2018
Current date: מאי 12, 2017
PEM encoded chain: -----BEGIN CERTIFICATE-----
<edit : removed>
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
<edit : removed>
-----END CERTIFICATE-----

I am sure the details I inputted are correct as adding the email on other phones works. I've tried using other apps than Gmail, which resulted in the same error.
Any ideas?