About Yammer networks and Office 365 tenants

Beginning December 2019, we are changing what happens when a domain associated with a basic (free) Yammer network is added to your Office 365 tenant. We will start with a gradual roll out and complete the process by the end of the year.

For the best end-user and management experience, it is required that one Office 365 tenant is associated with just one Yammer network. If you are not in this configuration, we recommend you consolidate previously migrated basic networks into a single primary network for your tenant in order to move Yammer into a supported state for your tenant. Click on Highlighted Links for further detail steps and information.

• For more details click Announcement  by Microsoft
• To Manage Yammer domains in Office 365
  
• To Network migration - Consolidate multiple Yammer networks
• About Yammer Network and Office 365 Network