Can't find master key when using hashicorp keyring plugin in mysql enterprise edition

I had followed the oracle documentation for certificate and key preparation and hashicorp vault setup, but it seems like doesn’t work for me. Perhaps I was not on the right track.

https://docs.oracle.com/cd/E17952_01/mysql-8.0-en/keyring-hashicorp-plugin.html#keyring-hashicorp-plugin-configuration