I was able to resolve the issue:
the command:
sudo systemctl status zerotier-one.service
also printed some error output. In my case it said:
ERROR: unable to configure virtual network port: could not open TUN/TAP device: No such file or directory
That pointed me in the right direction for my search with the solution being posted here:
The service needs to start “/usr/sbin/zerotier-one” with the “-U” parameter which was not the case for me. Now it works again.
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