Error while creating test user on Facebook "The ability to create test users is disabled temporarily"

Question

While creating a test user in my app in Facebook developer, I get this error:

The ability to create test users is disabled temporarily

Answer 1

According to a banner notice on the official documentation page for "Test Users":

We are temporarily removing the ability for apps to create new test users. This should not affect existing test users. We will share an update once access to creating new test users has been reinstated.