Is there a way that Auth0 can throttle or regulate user logins (place them in a waiting room/user queue) when an application is at capacity (no available resources)?
Such a feature could use a feedback mechanism where the application signals when to admit new users, or it could simply throttle new users to a pre-defined max new sessions/second, etc.
There isn’t a built-in feature that would allow this. If you are wanting to build this so that it occurs after a user successfully authenticates, you may be able to do it with a redirect rule, but there could be some challenges with queuing the users.
You may be better off having Auth0 return the tokens after a successful authentication and then handle it from there.