if you have a representative, you cannot link your application unless you will cancel your rep. correspondence goes to your rep first and then it's your rep that informs you. this is one of the disadvantages of having a rep because they act as a middle man.
That's quite right, itsats. I have a representative and she gets the updates on my behalf, but I still follow status on eCAS - either me or my spouse can login in using the application number, last name, date of birth, place of birth. It's not a lot of detail, but still lets me know about status changes.