1. Create the TeamCity Application Link as described here.  

    You don't need to create a link for every project. One Application Link will be enough. 

      

    You will see your link in the Application Links list. 
  2. Configure Basic HTTP Authentication for Outgoing Authentication as described here. Use the credentials of the TeamCity user you configured earlier. These credentials will be used by the Application Link.  
       
  3. Give the View Issue Source Tab permission to eligible users.