Upgraded VCore 3 400 with Canbus and need some help

Hi all, I recently upgraded my VCrore 3 from mosquito hotend to rapido and added in Beacon and EBB 42 Canbus (V1.2) and Toolhead upgrade Followed the instructions (or at least I think I did) and have a few teething issues that i hope someone can help with. I also got a 4 wire part cooling fan with the toolhead upgrade kit. I have wired the part cooling fan power and -ve wires to the Octopus PA8), and the pwm wire to the Canbus, pin PA1 per the instructions. The hotend fan is connected to the Canbus pin PA2 On firing up, the part cooling fan is on 100% (wow, it puts out some air), but as RatOS came online, nothing at all changed an dstays at 100% regardless of % set at I am a little confused. In the configurator, am I supposed to call it an Input Voltage or Digital PWM. It is a 4 wire fan, but 3 are used (not using the tacho wire) Any help would be greatly appreciated