FYI:
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To those who cannot link their application to their account in CIC.
I just called the CIC while having my application open on the screen. While talking to them I asked to lead me through the answers. And it appeared, that the spelling of the city of birth is different on the file, not the same as on the forms that we submitted with the application. Why is it different? I have no idea.... The guy on the phone said that wrong spelling of the city of birth and wrong number of people on file (the last question on the form) are the most common issues.
In my case, number of ppl on file is 4 (apparently adults only: my husband and I + my parents). And after the guy gave me the correct spelling of the city of birth I finally could link my application."