The last days I struggled with syncing my Business files from my personal business OneDrive and several team or sites.
I tried out many solutions or workarounds published on internet but none of them was the solution.
The situation you see on screen is:
After searching for a time on the internet I found on the following page the solution. Due to an Windows Update for Microsoft Office 2013 as you can see in the following print screen:
After removing update KB3085566 and restarting my device Onedrive for Business syncs my files again.