Thanks, it worked.
Calendar doesn't synchronise on Huawei Honor 4x
@Bernhard DAVdroid is not initiating the synchronization. It relies on being called by the Android synchronization framework. According to the debug info, calendar sync is set to 240 min:
Calendar sync. interval: 240 min
I don’t know why “Calendar” doesn’t appear in your Android account settings (as seen in your screenshot). Is your calendar provider even enabled? You can have a look at: Android Settings / Apps / All (maybe: “Show system”) / Calendar Storage (com.android.providers.calendar).
Or maybe DAVdroid is prohibited to access the Calendar provider for some other reason (permissions, privacy guard, …)
@rfc2822 Thank you, this was actually the solution! After enabling the android calendar, synchronisation works as it should.