Resolved: Yammer Service Disruption

The configuration updates by Microsoft are complete; however, they\’re continuing to monitor performance patterns to ensure Yammer is completely functioning. All Yammer features are working as expected with the exception of the Yammer Activity Stream Ticker. Microsoft intends on re-enabling the Activity Stream at 7:00 PM UTC on January 5, 2018 after verifying that the service is fully functioning.

More information: Resolved: Yammer Service Disruption

Story added 5. January 2018, content source with full text you can find at link above.