Cisco AP 3702 cannot be 'Primed'

Hi Network Gurus!

Would like to consult you on something. Setting up a vWLC (Cisco Virtual Wireless LAN Controller (v8.4.100) and integrating Cisco AP 3702UXK9 in my network.

I was able to broadcast the SSID with the 2.4GHz domain but I was not able to do the same with the 5GHz band. Read Cisco documentation and found out that I need to 'Prime' my APs.

Tried downloading the application on my android phone and my iPhone but it still says 'try to connect on a universal AP' but the settings on my WLAN 'Universal AP Admin' is enabled. Configured country code is okay as well, but shows 'UX' in the specific AP.

Hope someone here can help.

Thank you!