+1(514) 937-9445 or Toll-free (Canada & US) +1 (888) 947-9445
According to this page for urgent service you do not need an appointment

https://www.canada.ca/en/immigratio...n-passports/new-adult-passport/apply-how.html

“If you need your passport in 2 business days or less

Go to a passport office (Service Canada Centre – Passport Services) for walk-in service. You do not need an appointment. New
  • Make sure it’s a passport office and not a regular Service Canada Centre or you won’t get your passport in time.
  • You must provide proof that you need the passport in 2 business days or less.”
 
I got my Citizenship certificate today and would like to apply for passport in-person.

Could someone please guide me on how to submit a request to Service Canada for an in-person passport application appointment?

Although I don't have any urgent travel plan, but prefer to apply in-person than sending a mail application.

Thanks in advance.
Fill this form

https://eservices.canada.ca/en/service/