this question has been answered by many people on this forum , just use the email you received that says your application has been received by CIC, that's your AOR.
Application Received 27-Jul-2017
AOR 12-Sep-2017
Pre Arrival Letter 20-Mar-2018
Medical Request 20-Jun-2018
Medical Passed 15-Jul-2018
Ghost Update 20-Nov-2018
Decision Made 3-Jan-2019