What IP address do I assign in order to keep communication between my AP and my router?

My network setup:

WAN > Router(pfsense) > AP(tomato)

The gateway for my router is 10.12.1.1

The gateway for my AP is 10.12.1.201

My AP is only an AP, not a DHCP server. The router is my DHCP server.

What I'm trying to do is create a new bridge(br1) on my AP, to assign it to a VLAN. Well I need to give br1 an IP address.

On br0, my IP is 10.12.1.201.

I tried to assign br1 an IP of 10.12.2.201, and when I try to access my guest wifi (which is linked to the VLAN using br1), I have no inteet coection. So I'm guessing anything on br1 can't communicate with my router.

Here's some pictures:

*edit: That screenshot shows 10.12.1.202

Well first I tried 10.12.2.201 and that didnt work so then I tried 10.12.1.202 and that didnt work either.