@varungole - so I received a reply from ADVO but the reply wasn't helpful. They asked me to raise a case specific query with my VO as they don't have my application. They mention that they are only responsible for the visa printing. I have written to them again explaining that I was asked to contact them in the PPR email and that the query is relating to having more time for submitting the passport. Just to be safe, I have also raised a case specific query with IRCC and sent an email to CPC-Ottawa (which I think is my VO based on where the original PPR originated from), but their standard response time is 20 business days (which would be well beyond my 30 day deadline).
@others on the thread - has any one been in a similar situation? My final plan of action if I don't receive any reply from either ADVO or CPC-Ottawa is to still try submitting the passport after the 30 day deadline (either at VFS or via Aramex) and hope for the best!