Ntp server/chrony

Hi,
on proxmox in a lxc with some containers,
I would add a ntp server for them:
so apt install chrony

added allow IP/24 to the chrony.conf



but testing it specifying the IP of the lxc and 123 as port it NOT works.
Any idea/suggestion ?

installing ntp:
after apt install ntp
but where is located ntp.conf ?

Thank you!