Looks like you didn't confirm your request.
I'm trying to unlock my wife's iPhone 6. Third time with zero result.
Every time I get reply: "We had to cancel your unlock request. Looks like you didn't confirm your request."
But... actually I did it, I've confirmed! And every time there were replies: "Your request confirmed and so on..."
Requests numbers: NUL918656306194, NUL922056487935, NUL818556307038.
Thanks in advance for your kind reply.