I know but it worked for me. My application number started with W. My husband applied in Dec 2015. And at that time I wasn't aware about the process of linking paper application to your online account. The moment we got medical request, we figured our application number out of that and used that url to track the application. I remember seeing two email from cic but none explained if its an approval. I went on the same url the status was changed to closed and approved!
Try using it, it should work for you if no changes have been made in the system