Which method did you use to try to link your OWP?
Anyways, just wait a bit more. I tried linking a week after I got my AOR and it didn't work so I tried again after 3 weeks and it worked.
Your application hasn’t been entered into our system yet.
If you applied by mail or in person, it may take some time for it to be entered into the system. Once we have it entered, you will be able to link your application.