FortiWIFI 60D-POE Bridged wifi access point

Hi I would like to setup a bridged wifi access point to my production LAN.

I currently have two SSID's which have their own subnets, One for public access to the internet (Visitors) and the second access to the LAN.

I have followed several guides to add a new SSID which is local bridged and not tunnelled. I then have tried to create a separate FortiAP profile to use the internal wifi controller but I get the message "Maximum number of entries has been reached."

I have tried to remove the other two SSID's from the existing profile and add just the new bridged SSID but I get the same message.

What am I doing wrong?

I'm running 5.2

Thanks