Hello,
This is my general setup. I have an RB433 routerboard.

eth1 - WAN connection/static public ip address
eth3/wlan2 - bridged with hotpot setup on the bridge and dhcp server on bridge
eth2 - dhcp on bridge - no hotspot

I have a unfi ap that connects thru eth2, I am able to see the unifi ap from a the unifi controller on a different subnet and configure it and I am am able to connect to the unifi ap and gain internet access.

I am also able to connect with a computer to eth3/wlan2 and authroize thru the hotspot page successfully and gain internet accesss.

What i am trying to do is connect the unfi ap thru eth3 so once the unifi ap is setup all users
connecting to it will receive the hotspot login page. Right now they don't because the ap is on eth2 and no hotspot is configured for this. Is there a way for the unifi ap to bypass the hotspot login so for the first time turnup it established connection with the unifi controller. Then after the setup of the unfi ap, all users that connect to it will receive the login page. Thanks for any help.

Hey there,

You would first need to setup the Unifi AP via the controller software. You would not be able to use the guest AP though.
Once you have an SSID on the Unifi AP, you would then need to give it a static IP and add it to the allowed IP's in the hotspot controller. Finally, to have access to the hotspot you need to remove the DHCP config from Ether2 and bridge it with Ether3.
I have found that I need to disable the hotspot before creating bridges with its interface. It sometimes corrupts the configuration.

I hope this helps