Calender hide private appointments when synced from Outlook using CALDAV


I use CALDAV to synchronize my Outlook calendar to the disroot calendar: It works fine except when I share my calendar with other people.
The entries marked Private in Outlook then are hidden - I would like them to be shown as blocked without information about reason etc.

Any idea how to get there?

best regards

I’m pretty sure this is an issue with Nextcloud which apparently they will not fix