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Hi, I wrote it many times It’s mention in IRCC instruction you got along with portal1 mail “In your reply to this email, copy and paste the template below and fill in the information for yourself and for each member of your family (if applicable). If you are not sure of the exact date(s) of your entries to Canada, you can provide your best estimate. IRCC requires this information in order for us to create a Confirmation of Permanent Residence document for you (and your family members if applicable) and to create an account for you to become permanent resident(s) through the portal.”