Have you tried the lighthouse_watchman_update? I had your problem and fixed it with this: (case sensitive)
launch lighthouse_watchman_update.exe in the folder C:Program Files\Pimax\Runtime
command line 1：lighthouse_watchman_update.exe –bw3
Then
command line 2: lighthouse_watchman_update.exe –Bw3 0x90030006
Shutdown your computer for a few seconds and restart
That is what ultimately fixed the same issue for me. Good luck!