retriving advertisingChannelSubType is null or --

When i try to retrieve advertisingChannelSubType through report CAPAIGN_PERFORMANCE_REPORT or thourgh Campaign service i get null or --, but in the UI i have Other values setted up in the campaigns like "Only Calls" or "Interaction with mobile app" -- -- =~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=

getting AdvertisingChannelSubType retrieves null or "--"

So im building a web for my clients I have tried from the Campaign Service and i get "advertisingChannelSubType": null, and from report CAMPAIGN_PERFORMANCE_REPORT and i get "advertisingSubChannel":"--" in the UI this campaign is SET to Mobile Applications. is there any way to get this value?