Application moved to "In process" on Feb 3, 2021. Didn't receive any notification of status change, just decided to check the status as I saw others here reporting that theirs had moved.
Give it a day or two then check online for their application status. Since you sent all applications together, all of them need to be complete for you to receive AOR. Given that two out of four got AOR, it means the rest are also accepted. There could have been a delay in sending AORs.
Lots of people didn't get AOR email (they are either delayed to be sent by email or arriving by mail). Call IRCC to get your application number, and make sure to ask them to send all correspondence by email and not mail.
Got my AOR today. Had called CIC yesterday to ask about AOR and address change and the lady was sweet enough to say this has been a technical glitch and the call center folks can create an AOR request on your behalf. She also did mention that some of the AORs have been physically sent in the mail. My time line so far:
Location: Vancouver
App Type: Single
Physical Presence Days: 1100
App Sent: Sept 5th 2020
App Delivered: Sept 11th 2020
App Received: Sept 14th 2020
AOR: Feb 5th 2021