Videx 3123 and Ring intercom issue with door unlock

I have just purchased a ring intercom to connect to my videx 3123, I have connected the wires exactly to the instructions and unfortunately I cannot get the ring intercom to push a signal to open the door – it recognises when the door has been opened and also when the intercom buzzes, however it looks like its not sending a signal to the P connector for the door to unlock. The odd thing is the white wire wasnt required to connect. Im puzzled to what could be stopping this working - It is a supported intercom i checked before buying, Ive attached a photo of what it looks like inside and also a manual of the connectors - any help would be great as im stumped! thanks