@21Goose Yes I can try getting a proper resident SIN but I thought I should wait for a response for my PGWP application from IRCC.
My expired PR card and CoPR are back in India with my family and not with me right now ( I also told that some posts earlier as well) but I am planning to get them couriered by my parents to me. Then I can apply for a resident SIN.
Get them and go apply for a SIN. It's independent of everything else and will solve your problem of the work permit. There is no downside - worst case, you get denied and continue to wait as you already are.