Hi Ilya,
AdvertisingChannelSubType of UNKNOWN is an indication that the AdvertisingChannelSubType of the campaign is set, but it's set to a value that's not recognized in the version of the AdWords API used for the request. However, that doesn't necessarily mean that:
- The campaign is a Smart Display campaign (there may be other types of campaigns with UNKNOWN for that field)
- The campaign cannot be managed at all via the AdWords API.
I'm not aware of a way to definitively identify all of your Smart Display campaigns. The only option I can think of is to
label those campaigns and then use those labels in your request filters.
Thanks,
Josh, AdWords API Team