We are currently aware of an intermittent service unavailable error for update tile, recommended updates on environment page and cloud-powered support . These are related to the heavy traffic we are experiencing as a result of Dynamics AX 2012 R3 CU9 downloads. We are currently working on a fix to address this issue on priority.
Update: We have resolved the issue. The service is back online and we are closely monitoring the service for any anomalies.