Notification are sent by the system to help users create and complete their profiles.

Below are examples of these notification in two places, namely: When an opportunity is posted by an admin from an organisation they are subscribed to and when an admin adds them to a specific opportunity. 

1. Subscribers being notified of an new Opportuntiy

See the examples below. The links are dynamic and will take the users to the right place. 

2. User notified when they are added to an Opportunity

Administrators are able to invite users directly to an opportunity. They get a notification like this.

If these users follow this link the 'not joined' icon will not show up for them.