I have a SQ-issued ticket with my wife HKG (TR)-SIn (SQ)-HKT.
I understand that I need to do online checking with TR.
They refuse for my wife with an error message that the gender does not match the passport.
I checked very carefully on SQ booking and gender and passport are correct.
My assumption is that it is because I titled her Dr (she is) and they are sexist.
Any other less fun explanation?.