This incident has been resolved.
A fix has been implemented and we are monitoring the results.
We have identified the issue and currently implementing a fix. As a workaround, Heroku customers using Auth0 addon can use our Auth0 Management APIs to configure any tenant settings.
We are currently investigating an issue with Heroku Auth0 addon dashboard SSO. Heroku Auth0 addon users are currently unable to login to their Auth0 addon management dashboard. Please note that this does not affect addon end user authentication.