Verify that the Activity Feed Timer Job is enabled (SharePoint Server)
APPLIES TO: 
2013 2016 2019 Subscription Edition 
SharePoint in Microsoft 365
Rule Name: Verify that the Activity Feed Timer Job is enabled.
Summary: You must enable the Activity Feed timer job if you want users to receive information about their colleagues, such as updates to profile properties and creation of social tags and notes.
Cause: The Activity Feed timer job is not enabled.
Resolution: Enable the Activity Feed timer job
Verify that the user account that is performing this procedure is a member of the Farm Administrators group.
On the SharePoint Central Administration website, on the Quick Launch, click Monitoring.
On the Monitoring page, in the Timer Jobs section, click Review job definitions.
On the Job Definitions page, in the list of timer jobs, click User Profile Service Application - Activity Feed Job.
On the Edit Timer Job page, in the Recurring Schedule section, specify when you want the timer job to run, and then click Enable.
See also
Concepts
Default timer jobs in SharePoint Server 2019