In any case, I assume you enabled the particular auth method:
i.e.
vault auth enable approle
This will create the endpoint of auth/approle if you wanted a custom path, then you needed to do:
vault auth enable -path=test-tmp approle
The endpoint path here will be auth/test-tmp
Does that answer your question?
EDIT: you can do vault auth list to see what auth methods you have enabled and what their paths are. If it wasn’t obvious from my example above, if you don’t specify an custom path, it uses the auth method name as the path.