I have a KF account for which I've added the other FF details. When I check in for my SQ flight, I do not log into my account using KF credentials. Just use my other FF no to enter the details. The system picks everything up rather well.
You could also just request for FQTV only to be entered at check in.
Originally Posted by
chisquared
Could you explain how that works? Do you mean that you just put in a non-KF *A number into FQTV, without providing your KF number for FQTS?