No ping reply between 2 hosts in the same virtual network (ping reply dropped)

Dears,
I’m deploying a test environment with only one root server and several linux/windows hosts.
There is no internet access.

I successfully installed ZeroTier on the root server (moon) and on the hosts following the wiki, now my server sees all the hosts as member of the network I created.
All the hosts can ping the server and the server can ping all the hosts.
On any hosts, here’s the listpeers:
image

By the way, any hosts can’t ping each other.

Am I forgetting something?

Regards

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