The link in the email that is supposed to open your Enterprise Team dashboard is returning a 404 error.
Initially, the only person who will be able to access the Enterprise Team is the person who received the email titled "Package order: your-team Enterprise Team has been provisioned on Heroku". If that person is new to Heroku, they will first need to log into their Heroku account to open that link. If they have never logged in before, they will need to reset their password by clicking the Forgot Password link. Once that person is logged in, they can add anyone else they want to the Enterprise Team as outlined in our Enterprise Onboarding Guide.