Missing 'pkttyagent' Polkit
The default fallback polkit under Arch Linux is not recogniced. Its process name is "polkitd" and the Path is /usr/lib/polkit-1/polkitd. It just needs to be added under bitmask-vpn/pkg/vpn/launcher_linux.go
More Information under: https://wiki.archlinux.org/index.php/Polkit