Hi,
I made a modification to my firmware and recompiled it.
Zerotier has been updated and it is not working.
I think the template generated by openwisp is not compatible with the new zerotier configuration.
The template with version 1.12.1 works perfectly, with the new version 1.14.0 (they made the sync in the openwrt packages) it doesn't work.
this is new config
https://github.com/mwarning/zerotier-openwrt/blob/master/zerotier/files/etc/config/zerotier

I am writing to warn if this is something that has not been seen yet.
Perhaps it is best to create a feed with the old version until the openwisp mudule is updated.