Worked for me too in macOS Monterrey - intel iMac 27" - it solved that my iMac was not registering to my ZeroTier network. In my case it didn’t gave any errors, it just simply showed Not Connected in ZeroTier Central webpage.
Running on Monterey here, after upgrading to 1.8.2 it was working fine, then my networking took a dump and I noticed that message in ZeroTier. A reboot fixed it. Are you saying there is some fundamental underlying issue that I have to rollout 1.6.1 to all clients and then upgrade them to 1.8.2 to be sure this doesn’t happen everywhere?