It’s a very rudimentary server, being part of the camera’s firmware. There are no options I’ve found yet to enable or configure security on the OPC server side; I have reached out to Cognex as well to see if there’s anything I can do from that side. The error in Ignition does change to an unable to connect error (invalid endpoint, I think) when enabling security. As an additional note, when I have security disabled, I do see the connection as an actively connected in the camera (they have a status page).
One final FYI: I tried downgrading to 8.0.7 with the same result of not being able to connect. I then downgraded to 8.0.6 and I am able to connect to the camera’s OPC server again.