Google Play Store Internal Test cannot start roll out

Question

I am going to start rolling out the first version of the application to the internal testers.

But the button START ROLLOUT TO INTERNAL TEST is disabled

Answer 1

For those who may be coming to this question later, this button may be disabled if you recently signed up for new Google Play developer account.

You might be seeing a message like this:

This is due to a change by Google to keep bad developers out of the store. (an article)

This can be the case even though you're ready to roll out the changes.