The same thing happened to me. Two months after I submitted my application through the online portal, I still hadn't received any confirmation. I was only able to link my first PR application, not the renewal.
I would really appreciate any advice.
I have been outside Canada for more than 730 days out of the past 5 years accompanying my Canadian spouse, can I submit my application to renew my PR card from outside Canada via online portal and then travel to Canada to pick it up in person ?