In the area "Sick reports" under "More", you can Sdui all incoming sick notes as an admin in Sdui.
For a better overview, the sick notes are divided into:

• "Past sick reports": sick reports that were long ago
• "Current": Here you can find the students who are currently reported sick
• "Unread": Sick reports that have not yet been confirmed as seen

If you click on the pink button "Mark new ones as seen", you confirm the sick notes that are listed as "unread".

So that the parent who created the sick note can be sure that the sick note has been registered by the school, this person receives a push notification that the sick note has been confirmed when you mark the sick note as seen.