Make paid subscriptions take user out of usergroup at end of subscription

[imedic]

Originally Posted by Marco van Herwaarden

When the subscription ends users should be moved out of the paid usergroup automaticaly. If this doesn't happen start by checking if your Scheduled Tasks are running.

My schedule Tasks are working. What is the specific cron task that is responsible for subscription validity. Maybe I don't have this?
I have tested for one user and it does not deactivate his subscription after the subscription period ended.
So the user still is in Payed subscription users group after end of subscription.