Please add support for client certificates for VPN authentication. This feature would provide value for many customers.

For users with the option enabled it would replace username / password authentication. Users would need to upload the public key component of their certificate.

I'm using OpenVPN Connect on iOS since VyperVPN does not support the OpenVPN or Chameleon protocols. The lack of client certificates is user-unfriendly. It requires extra password entry and limits the auto-connect feature.