So did you reply to the initial confirmation email with all the information and then just didn't use the login link for portal once it was sent? Did you also fill out the info section as if you weren't in Canada then entered your date of return (Oct 2 in your case) in the "expected return to Canada"?I called IRCC call center and requested them to hold the process till I get back. They advised me not to login on to the PR Confirmation Portal till I am back in Canada. I also dropped an email stating the complete scenario.
I left Canada on 1st Sep and came back on 2nd Oct using Work permit and TRV. After coming back, they called me and sent the new password to login again. I completed the process on the portal though still waiting for my PR card.
Also once you came back can you confirm if they called you right on the date that you mentioned? I'm just wondering in case they don't reach out to me and where I need to call them for new link to portal.
Thanks for sharing your experience with this it's really helpful and I appreciate it!