It is the PR card. Somehow, on our PR card, there's a nationality. This means that it shows where you were from before you came to Canada. A lot of Hong Kongers use either the Hong Kong passport or the BNO passport to apply for an open work permit here. Somehow, for BNO passport holders, it shows GBN. That's also an excuse for trustees like Manulife and Sun Life to reject their application.
I would suggest, if possible, that there's no need to show their previous nationality. That will help them a great deal.
Thank you.