I would prefer to use a different email. I used the same email when I got the P1 email, 3 weeks have passed and no sign of P2 credentials. I then replied again to P1 email and provided a different email address (the one without any existing Permanent Resident Portal account) and got the P2 credentials in few days. Not sure if it's a coincidence. But the website mentioned "Do not create the portal account yourself as it will delay the process, IRCC will create it for you".
When you provided a different email address, did you write a comment for this issue ?
OR you just copy ,paste the template, and fill in a new Email ?