The processing of notifications received in Shield https://shield.amalyze.com/ for a particular user - in the previous month is not intended.
All notifications, which were received before 05/01/2020 at 00:00:00 for me as a user in Shield, cannot be edited in the following month.
(For e.g marked as read and more).
You can use the date setting in Shield (top right) at any time to exclude from your Shield view or data table the period that refers to the previous month.
This way, no notifications that are no longer relevant for the user from a time aspect will appear.
(See screenshot below):
Additional keywords: notifications, mark as read, edit notifications, why can't, noti, notifi.