AOR is a document that confirms IRCC got your application and they will start reviewing it.. It's not a number..Got biometrics request on 19 july and linked my application 22 july with GCkey and i got request letter for PCC AND PERMANENT RESIDENCE FEE but I haven’t got AOR so is my application number the one starts with E is my AOR number?
And yes Application number is that which starts with "E".