It is impossible to go live with developer test users on test business pages because a recent change for business pages requires the page to be a minimum of 60 days old / 100 followers to enable live video as a capability.
This rule has, unfortunately, also been applied to test user accounts, breaking the ability to run test lives in the development environment.
Our application, which operates on business pages, is currently under review. Despite our best efforts, we are repeatedly failing our review, not for the violation under review, but due to the fact that the FB reviewers do not have access to a business page that they can go live on. This will soon disable our application due to the inability to pass the review as the reviewer doesn't have access to the right tools, which underlines the need for a solution to this issue.