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

Seems like filling out all the fields is a requirement per the step 3 of the following page to rollout any release:

https://support.google.com/googleplay/android-developer/answer/7159011?hl=en

Answer 2

Have you filled out all required data under the things with gray check boxes? All 4 checkmark icons should be green and if you hover over a gray one it will pop up what is remaining e.g upload icons, feature graphic, etc.

Answer 3

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.