AOR would stand for Acknowledgement of Receipt, thus the date that you fully submitted your app adn IRCC acknowledged that they recieved the application.
I think you may still try to raise a CSE attaching a scanned copy of the PCC document itself explaining that this is a miss on your part and requesting clarification if you need to create an EE profile again or eAPR again or would they re-instate processing based on just this CSE.
I feel that this might not hurt. Any other experienced members?