I thought NTP was working on all 3 NVRs but now I don't think so. The times are off by a few minutes from each other. wouldn't they be the same if NTP was working?
I also try and do a manual update on the NTP server, time.microsoft.com and I get a failed message. Tried changing the IP address to other known NTP servers but I got the same message. Do I need to do something to my router to allow the NTP messages through? I didn't think so since the NVR is initiating the NTP request.