@armoured I just went to "Submit passport" section (massive thanks for leading me to it) and they are saying that I need to attach Appendix B. My RFV letter from IRCC has no mentioning of it? I would fill it out just to be on the safe side, but where do I find it?
Yes, that's annoying. Appendix B is just height and eye colour; write up a table with name and passport tombstone details and eye and height colour.