Seconding to use the protonvpn CLI program, it always worked well for me. These days I just use wireguard config files though, they’re much easier as you can just add them to networkmanager and you’ll auto connect on boot. IME the official VPN programs are often buggy. I also added a module to my waybar to show if I’m connected or not for peace of mind that the vpn started up correctly without any other indicator (if you use a DE you might already have an indicator for vpn connections)