I have been trying to add my c510w (ONVIF) to Agent DVR (iSpy) using a desktop. I made sure they are both connected to the same network, correct username and password and service URL but I keep getting the same error; OPEN_INPUT:Server returned 400 Bad Request. I've also tried removing the camera and re-adding it, toggling it off and on multiple times, also tried deleting the first camera account and creating a new one but to no avail. It works fine with the tapo app in my mobile, no issues at all so I dont really know whats causing this.