I think wala talagang password ang SSID na may hotspot dahil sa portal ang password.
Anyway nakalimutan ko details. Updated my EAP firmware to the latest 1.4.1
Using omada controller 2.7 64bit. For some reason, the 3.0.5 version cannot adopt the EAP "failed to send AP command" or wrong username/password lagi lumalabas. So I used 2.7
Sa authentication type sa portal, I chose "Voucher"