Calendar creation : 403 Forbidden

I am trying to create a new Calendar, but I keep getting an Error 403.
Here are some troubleshooting information:

  • the error occurs when I use the web interface of Nextcloud
  • it also occurs when using the caldav Python package
  • if I create a test account on Nextcloud and then try to create a new Calendar, it works fine.
  • but the calendar creation works from the Android app “DAVx5”
  • A fresh install of nextcloud-aio on another of my servers does not display this kind of behavior, and calendar creation works perfectly fine.

Calendar Version: 4.7.2
Nextcloud version: 28.0.5
Nextcloud AIO version: 8.2.1
Server : Linux Debian 12 (RPi Lite OS latest, ARM)