Unable to reach vcard-server (syno-DS212+) after update 3.4.0.24

REPRODUCIBILITY (100% or how often):
BUILD ID = OS VERSION 3.4.0.24):
HARDWARE (XA2):
UI LANGUAGE:
REGRESSION:

DESCRIPTION:

I use sailfish OS on several tools:

  • XA2
  • XA2 ultra
  • Jolla1

The XA2 is my busines-phone, the other one are for private use.
I only updated my xa2

After these update, my calendar-app builds for each new date one new calendar.
After same dozends of calendars i deleted the local carddav-account to my vcard-server.
Than i tried to configure the calendar-account as a new one and the calendar-app answers with:

Die Serverantwort hat keine Benutzerdetails für den angegebenen Benutzernamen aufgerufen.

Into the calender-settings the new calendar didnt appear.
Into the phone-settings/accounts the caldav-account exist.

The other tools i didnt update and they worked with the calender-app as well as before.