Not sure how you being on PGWP and you getting WP and employer getting an LMIA are related. Apprenticeships are supposed to go to Canadians and PRs because of their limited number. It seems like you may have already started yours. I am not sure if your employer will be approved for an LMIA for your apprenticeship and whether you’ll be able to get a WP. You should certainly try but in general apprenticeships are supposed to go to PRs and citizens. Maybe there are lots of apprenticeships available in your field. This isn’t usually the case and apprenticeships tend to be hard to secure.