Too many questions and arguments regarding linking an application when u have a representative. Dont believe me read what cic says below ty
Why was I locked out when I tried to link my application?
There could be a few reasons why you were unable to link your application.
You entered information that is different from what you submitted on your application
The information you enter to link your application must match what you had on your application when you submitted it. If you updated information after you submitted your application, enter the most recent information we would have on file.
You can try to link an application five times. If you are unsuccessful after five attempts, you will be locked out for 24 hours.
An immigration representative is handling your file.
If you have hired a representative, only the representative can access the application status through the Authorized Paid Representatives Portal. You must remove the representative from your file to link your application.
Upload the Use of a Representative (IMM 5476) form to your account, with “cancelling the appointment of a representative” selected on the form. Once we check the form, you will be able to access information about your application.
If you need to update your representative information, see: If I change my representative, do I have to tell Immigration, Refugees and Citizenship Canada (IRCC)?
Our system could be down.
See: What do I do if the online application system is down?