You are using the Vault userpass auth method mounted at auth/userpass.

To create a new user named “sally” with password “h0wN0wB4r0wnC0w” and the power-users policy, you would use the Vault userpass auth method mounted at auth/userpass. You would use the following command: “vault write auth/userpass/users/sally password=h0wN0wB4r0wnC0w policies=power-users”. This command would create a new user named “sally” with the specified password and policy. References:

[Userpass Auth Method | Vault | HashiCorp Developer]

[Create Vault policies | Vault | HashiCorp Developer]