Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hi AdminTheFront,
This issue is now reported at Service Health Dashboard (SHD) as incident SP31654 starting at Thursday, October 15, 2015, at 3:00 PM UTC. The user experience of this incident is: Affected users are unable to sync files with OneDrive for Business. Users may see repeated prompts to enter their credentials, but entering them will not result in a successful sync.
Tenant administrators can view current information and updates on SHD at the link here:
https://portal.office.com/admin/default.aspx#@/ServiceStatus/ServiceStatusHistory.aspx
We will update to the primary thread below once the issue is resolved or you can obtain the most recent information from SHD.
https://community.office365.com/en-us/f/148/t/413709
Thanks,
Eben