NTP Server - Unreach/Pending

[Koda]

My OPNsense is installed on a Proxmox Host and is connected to a Modem in Bridge Mode.

My NTP Staus show always Unreach/Pending for each added Server.
I have found an older solution (https://statath.github.io/blog/fix-non-working-ntp-in-pfsense/). This post describe exact my issue. Unfortunately it does not help.

Have anyone an idea for this issue?

Edit: With Chrony it works. I use chrony now