Hi Stefan,
According your description, this issue is more SharePoint Online related. In order to get the answer effectively, it is recommended to post a new thread in
SharePoint Online Forum for further discussion.
http://social.technet.microsoft.com/Forums/hu-hu/onlineservicessharepoint/threads
The reason why we recommend posting appropriately is you will get the most qualified pool of respondents, and other partners who read the forums regularly can either share their knowledge or learn from your interaction with us.
Thank you for your understanding.
Best Regards.
William Zhou CHN
TechNet Community Support
