How to add users to groups without forcing them to sign in first


I have integrated Auth0 with my application using saml2. Auth0 delegates the authentication to our enterprise sign on mechanism. I also use the authorization addon to set proper groups for users.

The problem i face now is that a new user has to login to my application atleast once so that they get listed in the users list of Auth0. Only after that I am able to add them to any groups to give appropriate permissions.

Is there a better way were i can add the enterprise user directly instead of asking them to login once before assigning them any permissions.