No support for error inquiries during VPN setup on Linux, but you can use OpenVPN by following command.

sudo openvpn --config kuins.ovpn

• Download Windows/macOS configuration file as "kuins.ovpn".
• Download client certificate file as "kuins.p12" on same folder.
  If you are using OpenSSL3, change the PIN encryption algorithm to the default AES256.
  openssl pkcs12 -in NIIcert202304XX-XXXXXX.p12 -legacy -nodes | openssl pkcs12 -export -out kuins.p12

You may use the GUI tool by reflecting the contents of the configuration file too.

Or use Windows,macOS instead of Linux.