Galaxy s5 not authenticating to Exchange server


Not sure what's going on, but I got a new galaxy S5 from At&t, and the authentication fails when trying to setup my exchange account.
A little background. I switched from Verizon to At&t " Long story". Anyway I actually Got my Boss a new Galaxy S5 as well except his phone is with Verizon. I had no problem setting up his exchange account on the exact same phone. The only difference is that mine is with AT&T.

Any thoughts?
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Ensure you have ActiveSync enabled on your mailbox (done from the exchange server). You can test this here 
Make sure you're accepting the activation of the exchange mailbox on your phone, it may be an icon in the notification bar.

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