I was able to l
It was just the single missing letter in Place of Birth on COPR.
I've finally been able to link my PR card app to my CIC account.Yes that could be the reason and as I said case should be same what is registered. So you may try the way its in COPR but COPR. I had all the places my family name in upper case so I used same.
It was just the single missing letter in Place of Birth on COPR.