Welcome Back, Davidread!
The prompt parameter is documented here.
The possible values for the prompt are
- prompt=none (a.k.a Silent Authentication)
- promp=login
- No prompt parameter sent
When using prompt=none if there isn’t a valid session, Auth0 returns an error message error_description=Login required as documented here. If there is a valid Auth0 session, the user gets SSOed in as described here.
In no-prompt cases, the user is redirected to the login page if there isn’t a valid session. If there is a valid session, the user will be redirected to the application callback URL with the code or token, depending on the authentication flow details.
When prompt=login is used, the user is forced to log in irrespective of whether a valid auth0 session exists or not.