I also faced similar scenario, I applied PR from Delhi India and came to canada on work permit. I was in Canada when I received the passport request from Delhi office and my dependents were in India . I called IRCC yesterday and explained them the complete situation, they told me that my dependents can submit their passport in India along with the same letter meantime CIC will send me a email confirming my passport submission to CPC Ottawa. I also wrote a email to
CPC-CTD-Ottawa@cic.gc.ca. . Today morning I got new passport request for submitting my passport to CPC Ottawa and also got reply of the inquiry email which I send yesterday. Finally , my dependents are submitting their passport in India with the original passport request letter (email) and I am submitting my passport to CPC Ottawa with the Annexure A attached with new passport request email.