OK, so the camera does do ONVIF motion events.
Provided it's enabled and configured in the camera, I'd expect to see events appearing in the Events page when there is motion detected.
Well that's not ideal.
Off-the-wall thing to try (unlikely to do anything though) - do you get any Live Video...
Does Windows prompt you for an access control agreement on ODM startup?
Maybe try running ODM 'as administrator'.
Presumably 'No Signal' either on the Video Streaming page?
Does the camera have any authentication settings choices for RTSP in its web GUI?
There are a couple of other ways to...
Isn't this just telling the NVR what action to take (usually recording) when it receives a motion event?
One way to determine if the NVR is simply responding to event notifications from the camera is to correlate / cross-check with the camera events as seen by the Events page in ONVIF Device...
The way I explored this a while back was by changing the volume size and seeing what happened, both for NFS and SMB/CIFS.
Where the server could apply a user quota on an SMB/CIFS share that worked OK.
But it's a bit of a grey area, the results for which vary with the camera firmware version.
Presumably if you update with CN firmware (which will likely not be possible via web GUI or the Batch Updater of they are running hacked to EN firmware) the NVR is then going to reject them with a 'Language Mismatch' error.