To bring the 
API in line with UI changes, the Product Codes 
AFMC and 
AFS have been deprecated and are now ignored by the API. Valid values are 
AFC, 
AFG and 
AFV.
The 
mobileContentAdsSettings information for an 
AdUnit will no longer be populated since AFMC is no longer supported; the fields will still be returned but they will be empty.
Dean Lukies, Ads Developer Relations