Hi Terry,
I know you posted this many months ago, but I stumbled across your question while putting together a Cisco ISE + Aruba 2920 lab at
https://kd9cpb.com/aruba-captive-portal. I made sure to put some tshooting stuff in there along with a couple extra steps I needed to do with certificates and AAA config. I'll try posting that in a few more places around here so anyone else that struggled through Cisco ISE with ArubaOS-Switch Captive Portal will hopefully have life a little bit easier :)
Cheers,
Tom