Android – ‘Start Rollout to Production’ button disabled

I contacted google play support. And yes, if you accidentally upload to production, you can no longer test. This was their response:

Thanks for contacting Google Play about removing a published Production APK.

We don't currently support the functionality you're requesting. In this case, you would need to unpublish the current app and then publish a new app with a new package name. I apologize for any inconvenience this may cause.

We currently require that once a Production APK has been published, the app must always have an APK in Production. This requirement is in place so that we are in compliance with the DDA by ensuring that once an app has been made publicly available, that it remains available for any users who may have installed it. However, we can delete an app in certain circumstance when an app has been unpublished for more than 24 hours and no install was detected.

As you have already unpublished your app, there is nothing you can do more from your side. Instead, we will wait for another 24 hours to see whether the app has any installs. If there is no installs, I will proceed with app deletion and get back to you after 24 hours. Then, you will be able to upload the same package in Beta track.

Thanks for your cooperation.

To see what still needs to be done, you can hover your mouse over the grayed out checkmark. There will be a popup that tells you what you still need to finish.