I also can't get NTP to work, with both a shelly 1 and a shelly 2.5 (the "time" in the top right section of the webpage is always not filled in, and obviously i can't use scheduled tasks).
I tried both with ip and local dns name, and with both the DNSfix firmware and the previous one, and i can't get it to work. It would be strange if it was a DNS problem because in my network config whatever is setup as a NTP server, the request is sent to my router (there's no internet access on port 123)
Obviously in the local log nothing is given as error.
To be honest I've not tried to tcpdump the connection, but it seems broken clear enough
thanks