So I'd do a
netstat -aon>C:\netstat.txt
then look for a line in the file similar to
UDP 0.0.0.0:123 *:* 256
then use Task Manager\Processes tab to see that the PID is for Windows Time service
then you can use prtqry tool to check from the 10 client.
https://learn.microsoft.com/en-US/troubleshoot/windows-server/networking/portqry-command-line-port-scanner-v2#step-2-specialized-tests
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