Message states camera mis not supported

[Rkkhudai]

I have subscription free Arlo system consisting of 4 cameras, then recently I had to replace the batteries on one off the cameras once I had replaced the batteries I for some reason had to re synchronize the camera and now I’m getting a message camera not supported you must get a subscription to activate this camera, and I know I’m allowed 4 cameras with subscription and the fact it was working up to now without it, so what’s the deal?,  am I doing something wrong?

[DannyBearAgain]

What model cameras do you have, the essential model requires a paid subscription when the trial period ends.