Unfortunately, I have the problem that the calendar subscription is not automatically synchronized.
I was able to create the ical export link. It is also possible to subscribe to the calendar. In Outlook I can also successfully create a new calendar using this link.
Unfortunately, this is not synchronized when I change an existing appointment or enter a new one.
In the menu item I have already reduced the iCal cache to 1 minute for the test.
Which settings did I miss?
Thanks for the help!