Vault, Keybase and PGP - multiple key handling

Hello!

As documented here: https://www.vaultproject.io/docs/concepts/pgp-gpg-keybase.html#initializing-with-keybase

If the keybase:username has more than one PGP key listed and verified in their profile, how does Vault CLI decide which key to use? Is there a way to specify / choose one key over another?

Thanks,

Stuart