Originally Posted by
KATERGOO
You can fill in the "Claim missing miles" form, once you have logged into your account.
TK flights missing miles are credited right away !

I tried that, and the system said "free tickets are not eligible for mileage earning".
This was a cash fare, although certainly cheap, but definitely not free...
Very annoying, I would likely have opted for a slightly higher fare rather than lose out on the miles.