Thanks.. Family Name, Given Name and Date of Birth... you put these of principal applicant?? Also, was the count same when linking to principal applicant account and sponsor's account?I used Family Name, Given Name and Date of Birth. As mentioned before, what's tricky is the "Number of family members, including the primary applicant, that are part of this application". At first, I thought it would be as question 3 under Application Details on IMM-0008, which is "1" in our case. But, it worked with "3" instead, which I guess is sponsor + co-signer + principal applicant. So, try with different numbers here.