I can authentic without it. However as soon as it launch the software
with Nord active again the software thinks I have never authenticated it
HobbyCollector
I can only say that I have never experienced this.
For a moment, I suspected that the MAC address could
change with OpenVPN (via TAP adapter) unlike NordLynx ..
.. However, manually switching to OpenVPN in the NordVPN app
does not affect SF Authorizing for me, and my physical
MAC address is still listed in the log.
So I have no idea what could be causing your problem.
If I were you, I would try a different VPN provider
(trial) to narrow down the problem.