It might help understand if you could make a short video of the camera during start-up, and a screenshot of the controller screen after the camera seems to have done as much as it's going to do. You can upload the screenshot directly here to the Forum. The video you will have to post somewhere else, like YouTube, and add a link to it here in the Forum. Be sure to turn off OBS before making the video. Humans can't hear it much, but the video will record it as a loud noise that overwrites all other sound on the video.
When you mentioned all of your other cameras work fine, I assume you meant on this same H520?