Just installed Tazer DT on my 2023 1500 Longhorn and programmed a PIN. Be aware that PIN Lock Enable is off by default and needs to be toggled on after coding the PIN.
I mistakenly assumed that the Full Reboot + two sleep cycles sequence is only required when changing non-Live Vehicle Settings, but not for Live function settings. Did the reboot sequence after marrying the Tazer. Then proceeded to setting the PIN Lock plus a few other Live options and omitted the reboot sequence afterwards.
The PIN still lock worked as advertised. However, Engine Light came on and stayed on, and a few DTCs were logged.
Luckily, clearing the DTCs followed by a full Reboot cycle cleared the issue completely and all is well, for now.
A side note: I asked zAutomotive earlier today about the Killbyfob feature, and they confirmed that when the vehicle is locked by the keyfob's button, the very same keyfob's unlock button will be needed to bypass the PIN entry. The other keyfob will not do nor a cloned keyfob. Those would require PIN entry, according to them.
Edit: Firmware version used was 18.2.4.