I have provided an explanation (by using my parents UCI) and attached my invitation letter & CanadaPost delivery status form in the webform CIC. Is there anything else I can do? CanadaPost mentioned me on phone that it is delayed because of COVID19.It seems like 14 March is the hard deadline unfortunately. You can try sending them explanation along with the tracking details. But I doubt that they will accept it. 60 days is a reasonable amount of time.