For the guys who have DM but no landing appointment if you’re in Canada you can gather your DM letter 2 copies, 2 photos(PR format) your passport and go to any border point and do your landing. A friend of mine did just to not wait for the landing appointment.
So, if you want to check this call IRCC but definitely works. You’ll get your CoPR that day since your interview will be made by an immigration officer.
Good luck!