Originally Posted by
xliioper
Correct. VS G class is the booking class VS uses for Upper Class awards when you redeem miles. So the DL system just sees it as an award flight and won't award any Skymiles/MQDs for flight. GUCs applied to AF/KL flights book into Z class which is a revenue fare class on AF/KL (like DL, this is the lowest business booking class on AF/KL) and thus do not have the issue.
I used a GUC on Virgin on a revenue ticket and had the same problem. 0 MQM/MQS/MQD. I had to call in and get it done manually.