For those who haven't received the POE / correspondence letter on their GCKey after stamping, don't worry about it. I mean it is good to have but not compulsory. If you have already booked flights then don't cancel it just because you haven't received POE. I contacted IRCC Delhi regarding this and got this reply:
Thank you for your email. This is in response to your recent email enquiry to the Migration Section of the High Commission of Canada in New Delhi.
Port of Entry introduction letter is not required for you to travel to Canada. The information about your permit is in our global computer system and can be accessed by immigration officials in Canada. Please proceed to travel to Canada within the validity of the visa placed in your passport, your permit will be issued upon your arrival in Canada.
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Gist of the email is that POE is not required to travel and the border officers already have access to your details. Moreover, I double checked this with Canada Border Services Agency (CBSA) too. Cheers!
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