SAML configuration

I am working to develop a new application on the top of openedx site( mylearning.com) IdP, and i want to use the user identity of my site to new application (SP) which is running in sub domain (sub.mylearning.com). How can I set up SAML configuration ?
I used the configuration mentioned in this link. But it does not work and i cannot see anything in this url {your LMS URL}/auth/saml/metadata.xml

I appriciate for any help

Django oauth works for this.