Ring Chime pro 2 PIN not accepted !!

I’ve recently been having issues with wifi strength to my Ring Doorbell 3. So I’ve bought a chime pro to help. I’ve just received this today and set up the chime to the my network, no problems. When I try and use the chime pro’s network to connect to the doorbell it tells me that the PIN number on the chime is the wrong PIN. I’ve reset the chime and re connected to the ring network again but this hasn’t helped. It still says the PIN number is wrong although this is the PIN number printed below the QR code!!! Frustrating :-[ Is there anyone out there that can help please.