Convert solar panel

My inlaws bought a previous version of Ring security cameras that came with solar panels. The old Ring panels had a micro usb connector that plugged into the back of the cameras. We moved and took the cameras with us, but since they dont remember what email address was used to set them up, Ring has told them they cant use them anymore. We bought them new Ring Stick up cameras that have solar panel connectivity. However, the new panels connect via a barrel connector, not micro usb. I read somewhere the connector is 2.1mm, so I bought on a female micro usb to 2.1mm barrel connector on Amazon, but the barrel doesn't fit in the back of the camera. Anyone know either the width of the barrel or have a link to purchase a connector?