Microsoft has just updated the following KB Article:
An update for the authentication certificate in System Center Configuration Manager Asset Intelligence is available
In System Center Configuration Manager, the issuing certificate that System Center Online uses to validate the Asset Intelligence public authentication (bootstrap) certificate expires on May 29th 2015. After this date, System Center Online does not recognize the pre-provisioned public authentication certificate used by the Asset Intelligence synchronization point site system role to enroll with the service.
Note The AI ...More...