If the activity feed stops updating properly, clicking Rebuild Activity Feed removes the feed for each user and builds it again. This is the feed that My Activity Ticker, Space Activity Ticker, and Activity Emails show, and Axero normally keeps it current in the background whenever someone's permissions or access change. While the rebuild runs, a user might lose access to their activity feed for several seconds, depending on the size and activity of your site.
Go to Control Panel > System > Advanced System Utilities, then click Rebuild Activity Feed.
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