Hello,
I have a variety of Dahua (Empire Tech) cameras to include the 2MP Starlight, 4MP (5442 series), 5831 8MP, and 4231 2MP boobies. All of them sync with my Synology NAS for NTP except one of the 5442s and both boobie cams.
Both 5442s are running the same 12-03-2020 software build...