When I try to use the NTP timecode source it doesn’t seem to ever update. This is just using default settings with the pool.ntp.org server address. Does this require additional configuration, server running etc.?
The NTP timecode source should be able to work on its own without any other configuration in Unity. However, check the firewall to ensure that Unity is permitted to use UDP traffic on port 123. Check our recommended setup docs which should grant Unity full permissions to receive incoming traffic.
I’d suspect that is the issue, but in case it is not, you can try a different NTP server, or use Wireshark to check if the NTP packets are being sent and received correctly.