This tutorial will show you step by step how to add notification and task for specific user with access to admin panel.

Step one, add user so will be able to choose user to associate with task.

Now, we may add task. Assign user, add details, choose type.  

Next, make sure that user is able to see task/project. At my case, I added task for vendor, so need to find at ACL plugin, and add settings for vendors.

Even with ACL user will not see anything at own view of admin panel, if widget will not be activ.

Final configuration, if we want to add notification for user

With this settings, result will be as below