davdroid calendar not automatically syncing on P8lite

[wackyvelo]

I use Davdroid both on a Galaxy S7 Marshmallow and Huawei P8lite Marshmallow.
On the S7 all goes well and automatic background caldav syncing with Synology Diskstation and Owncloud works like a charm.

However on my P8 lite, manual syncing does work for both caldav servers but not the autmatic background syncing.
Anyone an idea what can be wrong. Do I have to enable or assign rights to something?
Thanks for helping me!

[rfc2822]

Please provide debug info.

Synchronization is managed by Android. DAVdroid doesn’t run all time, it’s just called by the synchronization framework of Android. So, if synchronization is not started, I guess there may be something wrong with your Android settings.

[rfc2822]

Is your question answered by the recently created FAQ: Why is synchronisation not triggered as set it in sync interval settings?