I wanted to put this there and for anyone who has this problem:
I have a Logi Circle 2 camera that I upgraded to use HomeKit Secure Video. If you don’t have one and are thinking of getting one, keep in mind that once you do this, the only way you can set it up is through the Home app. I also upgraded my Linksys Velop network to work as a HomeKit router, and accidentally wiped my house and had to set everything up from scratch.
I added the routers first and started adding all the other accessories. Everything worked perfectly, except for the Logi Circle 2 setup. All the forums talked about whether people either had to reset the camera until the Home app recognized it, or they had to go through Logitech support to downgrade their firmware. to try to ask for a replacement.
Fix this: I had to set up the camera BEFORE setting up the HomeKit router feature. Once I removed the Linksys network from the Home app, it immediately paired and then I was able to pull everything back into the Home app.
TL; DR: If you want to use HomeKit routers, you may need to configure some accessories BEFORE adding the routers to the Home!