Autorenew setting for the service plan is set to 15 days before expiration. There is a trial subscription period which is only 14 days. How will the system behave with such configuration?
Automatic renewals are not working for the trial subscriptions, only non-trial subscriptions will be renewed 15 days before expiration. There is a feature request with id #PBA-46350 ("Allow automatic renewals for trial subscriptions") to implement possibility for trial subscriptions renewals.