Have you configured a DHCP server on interfaces
Do you have any interface natted?
SSID1: Private LAN with (X.X.X.X/24 private subnet) natted to wan wan interface
SSID2: Guests with (X.X.X.X/24 private subnet) natted to wan interface
SSID3: Test WLAN with (X.X.X.X/24 private subnet) to wan interface
This is a example for nat setting, in dutch but follow the printscreens a made