so i’ve removed that option still fails but different reason now I think.
root@DietPi:~# journalctl -xeu dietpi-vpn.service
Dec 23 19:27:19 DietPi systemd[1]: Starting dietpi-vpn.service - VPN Client (DietPi)...
░░ Subject: A start job for unit dietpi-vpn.service has begun execution
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░
░░ A start job for unit dietpi-vpn.service has begun execution.
░░
░░ The job identifier is 88.
Dec 23 19:27:20 DietPi openvpn[580]: Options error: Unrecognized option or missing or extra parameter(s) in /etc/openvpn/client.ovpn:14: ncp-disable (2.6.3)
Dec 23 19:27:20 DietPi openvpn[580]: Use --help for more information.
Dec 23 19:27:20 DietPi systemd[1]: dietpi-vpn.service: Main process exited, code=exited, status=1/FAILURE
░░ Subject: Unit process exited
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░
░░ An ExecStart= process belonging to unit dietpi-vpn.service has exited.
░░
░░ The process' exit code is 'exited' and its exit status is 1.
Dec 23 19:27:20 DietPi systemd[1]: dietpi-vpn.service: Failed with result 'exit-code'.
░░ Subject: Unit failed
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░
░░ The unit dietpi-vpn.service has entered the 'failed' state with result 'exit-code'.
Dec 23 19:27:20 DietPi systemd[1]: Failed to start dietpi-vpn.service - VPN Client (DietPi).
░░ Subject: A start job for unit dietpi-vpn.service has failed
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░
░░ A start job for unit dietpi-vpn.service has finished with a failure.
░░
░░ The job identifier is 88 and the job result is failed.
Dec 23 19:28:05 DietPi systemd[1]: Starting dietpi-vpn.service - VPN Client (DietPi)...
░░ Subject: A start job for unit dietpi-vpn.service has begun execution
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░
░░ A start job for unit dietpi-vpn.service has begun execution.
░░
░░ The job identifier is 401.
Dec 23 19:28:05 DietPi openvpn[1860]: Options error: Unrecognized option or missing or extra parameter(s) in /etc/openvpn/client.ovpn:14: ncp-disable (2.6.3)
Dec 23 19:28:05 DietPi openvpn[1860]: Use --help for more information.
Dec 23 19:28:05 DietPi systemd[1]: dietpi-vpn.service: Main process exited, code=exited, status=1/FAILURE
░░ Subject: Unit process exited
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░
░░ An ExecStart= process belonging to unit dietpi-vpn.service has exited.
░░
░░ The process' exit code is 'exited' and its exit status is 1.
Dec 23 19:28:05 DietPi systemd[1]: dietpi-vpn.service: Failed with result 'exit-code'.
░░ Subject: Unit failed
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░
░░ The unit dietpi-vpn.service has entered the 'failed' state with result 'exit-code'.
Dec 23 19:28:05 DietPi systemd[1]: Failed to start dietpi-vpn.service - VPN Client (DietPi).
░░ Subject: A start job for unit dietpi-vpn.service has failed
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░
░░ A start job for unit dietpi-vpn.service has finished with a failure.
░░
░░ The job identifier is 401 and the job result is failed.
Dec 23 19:28:52 DietPi systemd[1]: Starting dietpi-vpn.service - VPN Client (DietPi)...
░░ Subject: A start job for unit dietpi-vpn.service has begun execution
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░
░░ A start job for unit dietpi-vpn.service has begun execution.
░░
░░ The job identifier is 481.
Dec 23 19:28:52 DietPi openvpn[2360]: Options error: Unrecognized option or missing or extra parameter(s) in /etc/openvpn/client.ovpn:14: ncp-disable (2.6.3)
Dec 23 19:28:52 DietPi openvpn[2360]: Use --help for more information.
Dec 23 19:28:52 DietPi systemd[1]: dietpi-vpn.service: Main process exited, code=exited, status=1/FAILURE
░░ Subject: Unit process exited
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░
░░ An ExecStart= process belonging to unit dietpi-vpn.service has exited.
░░
░░ The process' exit code is 'exited' and its exit status is 1.
Dec 23 19:28:52 DietPi systemd[1]: dietpi-vpn.service: Failed with result 'exit-code'.
░░ Subject: Unit failed
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░
░░ The unit dietpi-vpn.service has entered the 'failed' state with result 'exit-code'.
Dec 23 19:28:52 DietPi systemd[1]: Failed to start dietpi-vpn.service - VPN Client (DietPi).
░░ Subject: A start job for unit dietpi-vpn.service has failed
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░
░░ A start job for unit dietpi-vpn.service has finished with a failure.
░░
░░ The job identifier is 481 and the job result is failed.
Dec 23 20:13:51 DietPi systemd[1]: Starting dietpi-vpn.service - VPN Client (DietPi)...
░░ Subject: A start job for unit dietpi-vpn.service has begun execution
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░
░░ A start job for unit dietpi-vpn.service has begun execution.
░░
░░ The job identifier is 565.
Dec 23 20:13:51 DietPi openvpn[15616]: Options error: Unrecognized option or missing or extra parameter(s) in /etc/openvpn/client.ovpn:14: ncp-disable (2.6.3)
Dec 23 20:13:51 DietPi openvpn[15616]: Use --help for more information.
Dec 23 20:13:51 DietPi systemd[1]: dietpi-vpn.service: Main process exited, code=exited, status=1/FAILURE
░░ Subject: Unit process exited
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░
░░ An ExecStart= process belonging to unit dietpi-vpn.service has exited.
░░
░░ The process' exit code is 'exited' and its exit status is 1.
Dec 23 20:13:51 DietPi systemd[1]: dietpi-vpn.service: Failed with result 'exit-code'.
░░ Subject: Unit failed
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░
░░ The unit dietpi-vpn.service has entered the 'failed' state with result 'exit-code'.
Dec 23 20:13:51 DietPi systemd[1]: Failed to start dietpi-vpn.service - VPN Client (DietPi).
░░ Subject: A start job for unit dietpi-vpn.service has failed
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░
░░ A start job for unit dietpi-vpn.service has finished with a failure.
░░
░░ The job identifier is 565 and the job result is failed.
Dec 23 20:15:26 DietPi systemd[1]: Starting dietpi-vpn.service - VPN Client (DietPi)...
░░ Subject: A start job for unit dietpi-vpn.service has begun execution
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░
░░ A start job for unit dietpi-vpn.service has begun execution.
░░
░░ The job identifier is 644.
Dec 23 20:15:26 DietPi openvpn[16210]: DEPRECATED OPTION: --cipher set to 'AES-256-CBC' but missing in --data-ciphers (AES-256-GCM:AES-128-GCM:CHACHA20-POLY1305). OpenVPN ignores --cipher for cipher negotiations.
Dec 23 20:15:26 DietPi openvpn[16210]: Note: Kernel support for ovpn-dco missing, disabling data channel offload.
Dec 23 20:15:26 DietPi openvpn[16210]: Options error: --ca fails with 'ca.crt': No such file or directory (errno=2)
Dec 23 20:15:26 DietPi openvpn[16210]: Options error: --cert fails with 'client.crt': No such file or directory (errno=2)
Dec 23 20:15:26 DietPi openvpn[16210]: WARNING: cannot stat file 'client.key': No such file or directory (errno=2)
Dec 23 20:15:26 DietPi openvpn[16210]: Options error: --key fails with 'client.key': No such file or directory (errno=2)
Dec 23 20:15:26 DietPi openvpn[16210]: Options error: Please correct these errors.
Dec 23 20:15:26 DietPi openvpn[16210]: Use --help for more information.
Dec 23 20:15:26 DietPi systemd[1]: dietpi-vpn.service: Main process exited, code=exited, status=1/FAILURE
░░ Subject: Unit process exited
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░
░░ An ExecStart= process belonging to unit dietpi-vpn.service has exited.
░░
░░ The process' exit code is 'exited' and its exit status is 1.
Dec 23 20:15:26 DietPi systemd[1]: dietpi-vpn.service: Failed with result 'exit-code'.
░░ Subject: Unit failed
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░
░░ The unit dietpi-vpn.service has entered the 'failed' state with result 'exit-code'.
Dec 23 20:15:26 DietPi systemd[1]: Failed to start dietpi-vpn.service - VPN Client (DietPi).
░░ Subject: A start job for unit dietpi-vpn.service has failed
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░
░░ A start job for unit dietpi-vpn.service has finished with a failure.
░░
░░ The job identifier is 644 and the job result is failed.
Dec 23 20:17:44 DietPi systemd[1]: Starting dietpi-vpn.service - VPN Client (DietPi)...
░░ Subject: A start job for unit dietpi-vpn.service has begun execution
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░
░░ A start job for unit dietpi-vpn.service has begun execution.
░░
░░ The job identifier is 723.
Dec 23 20:17:44 DietPi openvpn[17277]: DEPRECATED OPTION: --cipher set to 'AES-256-CBC' but missing in --data-ciphers (AES-256-GCM:AES-128-GCM:CHACHA20-POLY1305). OpenVPN ignores --cipher for cipher negotiations.
Dec 23 20:17:44 DietPi openvpn[17277]: Note: Kernel support for ovpn-dco missing, disabling data channel offload.
Dec 23 20:17:44 DietPi openvpn[17277]: Options error: --ca fails with 'ca.crt': No such file or directory (errno=2)
Dec 23 20:17:44 DietPi openvpn[17277]: Options error: --cert fails with 'client.crt': No such file or directory (errno=2)
Dec 23 20:17:44 DietPi openvpn[17277]: WARNING: cannot stat file 'client.key': No such file or directory (errno=2)
Dec 23 20:17:44 DietPi openvpn[17277]: Options error: --key fails with 'client.key': No such file or directory (errno=2)
Dec 23 20:17:44 DietPi openvpn[17277]: Options error: Please correct these errors.
Dec 23 20:17:44 DietPi openvpn[17277]: Use --help for more information.
Dec 23 20:17:44 DietPi systemd[1]: dietpi-vpn.service: Main process exited, code=exited, status=1/FAILURE
░░ Subject: Unit process exited
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░
░░ An ExecStart= process belonging to unit dietpi-vpn.service has exited.
░░
░░ The process' exit code is 'exited' and its exit status is 1.
Dec 23 20:17:44 DietPi systemd[1]: dietpi-vpn.service: Failed with result 'exit-code'.
░░ Subject: Unit failed
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░
░░ The unit dietpi-vpn.service has entered the 'failed' state with result 'exit-code'.
Dec 23 20:17:44 DietPi systemd[1]: Failed to start dietpi-vpn.service - VPN Client (DietPi).
░░ Subject: A start job for unit dietpi-vpn.service has failed
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░
░░ A start job for unit dietpi-vpn.service has finished with a failure.
░░
░░ The job identifier is 723 and the job result is failed.
root@DietPi:~#