Thank you for providing command result.From “show wireless radio detail”. I can see AP is operating with 80Mhz and speed can be up to 1.3Ghz with 3 stream. Normally, Android only support 2 stream, so 866 is Max as you said.From “show wireless client ...
Navigate to Config>DeviceOverride>Radio>Radio1, and see if this wlan3 is assigned or not.
To broadcast SSID, you need not only creating wlan(SSID), but also assigning created wlan setting to radio interface.
hope it helps.
Bridging mode is configured as "tunnel". Does this config match with your NW diagram? if traffic should go directly to GW AP, this config should be "local".
"tunnel" is used when traffic must path through from AP to RFS4000.