There is a global outage to Office 365. The majority of the global Azure infrastructure and backend services are affected.
Access to all federated services and Cloud Drive Mapper will be affected. Further details can be found on the 365 twitter page - https://twitter.com/msft365status?lang=en
, or in the 365 admin portal.
IAM Cloud are monitoring the situation and are looking at workaround options to restore the service until the problems are resolved by Microsoft.