Not sure. if you are in Toronto/Kitchener, i saw in the other thread that walks in are allowed in Kitchener passport officeWe submitted the passport applications (I, wife and Kid) on March 4th ( delivered). CC charged for me and wife on March 27th. But CC not charged for my kid. We called last week and the agent said my Kid's application has missing info and it will be delivered back. we waited for a week. Again I called today. The agent said my Kid's application is not delivered to their mailroom yet and mentioned she will send an email to the concerned department. Fingers crossed when it will be delivered back to me. I tried to book appointment online but no slots available near my location within a radius of 250 kms. I said it to the agent. she mentioned you need to try booking again and again until it opens up. Please let me know if any options available other than mailing the application form again. Mailing again is horrible as it will take more time again. can i walk in to any passport office and mention as application correction? I have travel plans shortly.
https://www.canadavisa.com/canada-immigration-discussion-board/threads/canadian-passport-in-person-timeline.748892/post-10040676