I have received P1 email on Jan 16th as well and responded with all details on Jan 17th. But still waiting for P2 email from Montreal IRCC. Should a new email be initiated to all the email addresses separately or in a single email? Also, Can you please confirm the mandatory details to be added to the email? And any insight on the subject & content of the email which worked for you?
I believe follow-up email sent either separately or individually works from looking at my experience and other people's experience in the thread. The mandatory details were the checkpoints received in the invitation letter in P1, including name, UCI, height, eye colour, email add, mail add, phone #, date and location of entry and if you are currently in canada. My subject line was "IRCC - Permanent Residence Portal (PR Confirmation)[insert your case number]". The content was to ask for any follow up as I have not heard from them for xx days, followed by the mandatory details they asked for. Hopefully this is helpful. Good luck!
