Yes, You have to say 2 people in that application because there are two applications submitted in the package... one for you as a sponsor and one for your son as a main/ principal applicant.When you register for GC key I realized it couldn’t go through at first for I said number of people in the application was 1 meaning my son but I read somewhere to include the sponsor so enter 2 instead of one and see how it goes
As for the online tool where you follow instructions for checking your application status i use my name and last and my UCI from when I was still PR then I see two sections one for me sponsor and one for my son on the other side
GC key is more detailed for me.
When you link, please use information of your son such as name, place of birth (same as written on her passport), dob, UCI etc, and you will be able to link the application with your GCkey account. If you still face problem then call IRCC and have agent with you on the phone and he will provide you the information exactly what is fed on the backend and you will be able to link then.
2nd part, when you check the status, use your son (principal applicant) information such as uci, first and last name and DOB, to check the application status.
Stay in touch and please update us with any update you receive from IRCC!!
thanks and Good luck
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