Enter sponsor's details in ECAS and you will be able to see both sponsor and applicant's progress. Do you have UCI for sponsor, if not, then enter your payment receipt number and then sponsor's DOB, and place of birth as you have given in the application.
If you enter PA's details then you can only see PA's application progress. PA's UCI number should be on medical and Bio request letter that you have.
Here is link for ECAS https://services3.cic.gc.ca/ecas/introduction.do?app=ecas
When I (I am the sponsor) enter my data in along with the UCI I have or the receipt number, nothing pulls up. When I use my wife's (the PA) information, information pertaining to her does pull up. Why is this?