How to properly sync shared tasks for collaborative use

[akuntsch]

Hi, great app you got here but I'm having problems using this as a collaborative todo list.

I've set up a shared calender with VTODO support (in Nextcloud via DAVx5, if that's relevant) and I am now trying to get tasks and subtasks to sync more or less immediately when refreshing/forcing sync in the jtxBoard app.

Whenever I make changes (e.g. add subtasks), they are not synced to another device when refreshing in jtxBoard.
It only syncs correctly when forcing a sync in DAVx5.

Am I doing something wrong here?

I already checked https://jtx.techbee.at/troubles-with-the-synchronization-see-what-could-go-wrong and have configured everything correctly.