What is secret_key(secret_connection.key) and how can I get it?

[Flyy-yu]

I am trying to configure the system to use YubiHSM. The tmkms.toml file require the path for "secret_key" and almost all online tutorial says you can get the key by using "tmkms keygen secret_connection.key" command. But "keygen" doesn't exist anymore. Can anyone tell me do I still need the "secret_key" and how can I get it If it's required?

Thanks!

[Flyy-yu]

Nevermind, it automatically generates one...