At present, the Missed Registrations only send emails when none of the registrations have been taken for that class/teaching set/tutor group. This means, if an Out of School is inserted in advance and the teacher doesn't take the register, then no reminder or follow-up will be triggered. I can see how some Schools might be content with this, but I think it will be useful if the reminders and follow-up can be sent if that particular teacher's register is incomplete. Could an option be included in the School Register Settings, which allow Schools to toggle between sending a reminder/follow-up when the registers have not been taken at all vs when only partially completed.
Christo
This is a bug for which we are releasing a fix. I will update with the release date once it is confirmed.