Actually, since you're using a different board for your webcam, activating the webcamd service on the board that hosts OctoPi isn't going to get you anywhere, as the webcam isn't physically connected to this board.
It seems more likely that there's an issue with the MotionEye OS board. Have you tried to connect to it ? Looking quickly at the documentation of this distribution indicates that there's a web interface you can reach, and which should show you what the streams URLs are, which you could then copy over to OctoPrint's settings.
Hope this helps, but in the case of a MotionEye OS problem, you would find more help on their support channels, which you can find here.
Ok, definitely strange. Can you check the browser's console see if there are any errors when you load the controls tab, it might help determine the source of the problem.
Actually, can you also include the systeminfo bundle not only the text file but the whole bundle (zip file) ?
Do you get the same error if you access your OctoPi server using either octopi.local, or using the IP address?
Translating to plain english here, the browser sees that the webpage you've loaded from http://octopi is trying to access a local, private device with the IP address, http://192...... Relatively recently, there was an update to major browsers to block external, public websites from accessing your local, private, network devices, for security reasons which kinda makes sense, but is equally annoying. So it considers that http://octopi is not 'private' so it can't access other private devices.
If you access OctoPi using the IP address, the browser should notice that they are both private and allow the connection to happen. Let me know if that works, if not we may have to come up with a different solution that might involve a proxy somewhere...
