Hi
You can send them through web form Proof of your request for PCC EX. confirmation number proof or any document that you already request the PCC from whichever country's authority.
On cic website:
If you can’t get a police certificate from your country or territory
If you’re unable to get a police certificate from a country, you’re responsible to show why you can’t get one.
To prove that you can’t get a police certificate, you must:
- show proof that you requested a police certificate from the correct authorities and
- write a letter explaining all the efforts you have taken to get one
As long as you send them any supported document of PCC application before deadline you don't need to worry.