Wacky WPA Enterprise Issue: iPhone connects, Mac does not

At work where we have wired and wireless networks. My MacBook Pro is connected via ethernet and my iPhone through our WPA2 Enterprise wireless network. Getting the iPhone on the wireless network was easy! Just added my user name and password and connected without a hitch. The Mac however, same settings, added, deleted, etc., never gets an IP Adx stays self-assigned. Works at home etc., tried different hints and tips but nothing seems to work. I don't get why the iPhone has no problem but the Mac just dies...very frustrating.

Would using the same Username and Password on two devices prevent this?
Have you tried setting up the Mac with (A) a different location (if you are using Automatic), or (B) trying another user account to see if that works?

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