So, the Nokia support replies and said that this is an App issue of DAVx5 but I have to wait for future Updates of the Phone too 😵 The support isn´t good and the 7.2 is a buggy phone with a lot of problems. All updates and patches bringing new problems. I decided to send it back and buy another phone. I hope this will help.
Calendar VALARM is not synced
VALARM is not synced from/to owncloud.
While owncloud currently does not support VALARM, this field is still stored in owncloud’s ics when I sync a calendar entry from thunderbird/sogo.
Syncing with davdroid there is no such field. It would be great if this would sync all the way through phone->owncloud->thunderbird and vice versa.
sorry, I did not realize this is a duplicate of Issue #70