Yeah, I've been doing it exactly as the instructions read, tried a few different combos (place of birth or passport, for example), it's just not showing up yet. I'm not worried since I got AOR but it's nice to know it's THERE and it's in the queue, lol. But I will keep waiting and checking e-mails.I was also in the same situation. Finally linked based on the instructions shared, in this forum. Check the posts shared earlier to link the OWP application, if you didn't see that.
All the best for linking and don't worry, linking is just for us to follow.. doesn't matter much. I have seen few have got OWP approval email in PA's email ID even without linking.