PA = principal applicant.
I didn't try to call the agent during my waiting period, but as far as I know if your application is incomplete at all it will simply be returned to you and you will not receive an AOR.
Edit: Was able to link my application.
Make sure you put "2" under the number of family members if it's just you and the PA.
I used application number, passport information, and where the PA intends to reside in Canada.
Also, look carefully at the page after you try to link the application.
It looks very similar to the one you see when you CAN'T link.