Ring Chime Pro - adding Ring Devices

Hi- I just added a Ring Chime Pro to my account. I already have 1 Ring Doorbell and 2 Ring Security Cameras that are installed and working great. Now I'm very confused about how I'm supposed to integrate these devices with my Ring Chime Pro. When I try to add a device to it, it's asking me to go to each device and scan its QR code or Mac ID. My doorbell is already mounted, so I can't take it off the door to find this code. One of my Ring cameras is mounted in a location that's 20 feet off the ground, so I'm not going to be able to get to that one either. I no longer have the boxes for these devices. If these Ring devices are already part of my account, why can't I just add them to my Chime Pro within the app?