It's your B fare you're flying on. Especially if you didn't make FC upgrade, you should see that you have 500 extra miles in your account tomorrow
I got 750 miles, but I had a B fare going out and did not get coach select when I checked in for the 8:30 flight. Is it because the 6:30 flight was a Coach Select Flight or because I used the kisok. I did get the Plat 1K as I was no upgraded also besides the 750 miles