Thanks for the response. In my case, I have added spouse and kid as dependents through my account . Yes, they got their COPRs with mine with different UCIs. Now, when I tried to link their application through my account.. I couldn’t find their applications itself.Every individual who gets COPR has a unique UCI number & application number. However, just adding yours does not mean that your family members will be linked to the same account. So, if your spouse has an IRCC account earlier, link through her account.
Since my spouse has a separate account for IRCC when she filed her student visa and work visa. I have linked her PR card to her IRCC account.