Resolved: Yammer Disruption
Vendor systems impacting Yammer were restarted by the vendor.
After restart, validation tests were performed which showed resolution. At this time, you should be able to access Yammer again successfully.
If you continue to have problems, please contact the Service Desk.
More information: Resolved: Yammer Disruption
Story added 16. November 2017, content source with full text you can find at link above.