Sorry to hear about this, neighbor! It looks like you’ve covered just about every step we would recommend from our Live View troubleshooting post. Thank you for taking the time to cover all these steps.
The only other thing I would add here is trying out the Rapid Ring app to see if your Floodlight Cameras will connect to live view from there.
As this is your first time setting up the Floodlight Cameras, it is possible that your network settings might be impacting video, although it would be odd for the Video Doorbell to work in this case. Here is our Help Center article about the ports and protocols for Ring devices. If you have an advanced network or network features, considering these settings will help.
Feel free to let us know how this goes! 