The plugin provides an option to generate activity every time a customer posts a review to any of the products.
Reign WC Vendors Addon provides the setting for the site admin to enable/disable the feature.
To access the configuration. Navigate to :
Reign Settings >> WC Vendors >> Add Review Activity and enable the setting.
If you want to generate a product review activity in the activity feed, then enable this setting Add review activity. When any customer will submit a review on the product, then a review activity will generate in the activity feed.