I tried this but it didnt work.
I called both the CIC contact center and also the border agent who completed my phone landing and both confirmed that my status was changed as PR on 29th dec and letter mailed out to me on 2nd jan (landing phn call completed on 13th dec and and document received by montreal on 18th dec).. its funny that it doesn't recognize my application # when I am trying to link my pr card application onto my CIC account..so no joy for me as yet!
Try to us UCI and Family Name to link your PR Card application. The reason is that the application number is different that the one for Express Entry. It should start with R302XXXX. Best.