Ring Pro Unable to connect to internet at all

A number of months ago, I bought a Ring Pro camera, and I have yet to be able to get it to connect to my WiFi network. It will get to the very last step, and give me the nice, generic message about how there must be a problem with my internet. Meanwhile, my Wifi works fine for every other device I attempt to connect to it: phones, laptops, desktops, extenders, Apple TV, etc; not one other thing has problems. Ring even sent me a second one to make sure it wasn't hardware related, and I got the same thing with that one. I have spent hours on the phone with my internet company, and everything looks fine. I have checked everything in the Ring support docs - including making sure I am using a 2.4 GHz network, and only on channels 1-11 - but still no luck. I have also verified that I have internet speeds of ~30 MPBS at the door, so slow connection is not an issue. I feel like I've wasted $250 for a useless doorbell. Has anyone else had this problem that was able to get around it?