The problem is that the /admin url does not work if there the requesting user is not an admin so it redirects to a blank page. This maybe changed in a more recent version? The chicken-and-egg problem exists because a user needs to confirm their account - which has the wrong (EC2) domain until they can login as an admin. But they need an admin account to change the account confirmation link domain.

Not sure of the best way to solve this. Maybe it would be with seed data?