1 dhcp client on bridge 2 wllan AP: no joy

Hi all, my first post here.

I’m quite a noob so be kind with me.

I think I have a simple problem to solve but until I haven’t found the solution.

I have a RB962 connected to the gateway through Eth1. I have set the DHCP on bridge 1 - put the 2ghz WLAN 1 ap bridge on the same bridge and it’s ok.
Craeted a virtual AP for to have two 2 ghz wlan and put it on bridge 1. Still ok.

I’ve tried to put also the 5ghz Wlan ap bridge but it doesn’t work. No client get the IP from the gateway.

The clients have to use the same ip range (192.168.0.1/24) both the 2ghz and 5ghz clients.

Where is my mistake?