You must do these steps first, then link to PR card application...
https://www.canada.ca/en/immigratio.../immigrate-canada/pr-confirmation-portal.html
From your GCKey account, click "link to application" (
the same as you link to your Tr to Pr).
Use UCI, passport, Family name etc....
Must keep
UPPPER/lower CASE letters as in your eCopr (
or better to copy and paste).
Place of birth: should copy & paste from eCopr as it is
Keep try again. Check every entries carefully. They give you 5 times/day to try.
*
AFTER linking, you will get the application number