I just got off the phone with immigration because even though I was able to link my application last week, I still haven't received an AOR and I was getting concerned. (Received on June 19 and linked). She said the AOR were a little slower being sent out towards the end of June. Even though everything is good in my file and application is linked, mine wasn't sent out yet but they are in the middle of doing a bunch at the same time and then sending them out. She said it's possible some are being sent my mail too even though an e-mail was provided. Hope this helps!