There was a bug this year in the default LabVIEW camera server, causing week 1 LabVIEW teams’ USB cameras to not work. Since then, a dashboard update (v2019.2.1) has been given to CSAs at every event that fixes that bug. If your camera streaming setup is returning Error 66, this updated dashboard will likely solve that problem. Seek out your local CSA and ask them if this could be the solution.
That being said, there’s about a million reasons for camera streaming not to work properly. Some of them are a lot easier to diagnose and fix than others. It sucks, but unfortunately that’s how it is. No one wants to see teams losing or missing matches because of faulty cameras, electronics, software, etc. The CSAs at your event are there specifically to help with these kind of issues. But we’re not miracle workers, sometimes it takes some time and missed matches before we can figure out a solution.