Sorry for being confusing. If you look at the original email your representative received and would have forwarded to you it would have this:
Welcome to the Permanent Resident Confirmation portal process. The attached PDF contains information and instructions regarding the confirmation portal process for your review. Once you have reviewed the document, hit reply to send the requested information outlined in the document. ***Etobicoke IRCC*** ETO????
Where ???? is a 4 digit number, likely the agent number assigned to your case. IRCC asks you hit reply because then this gets included in your response message. I can't do that because the email came to my representative so instead I copy pasted IRCC's email contents at the bottom of my message to them with the required details to make sure that its there - especially that last bit.