Hello,
out of curiosity, I just tried to attach a negative placement shared set to a video campaign using the CampaignSharedSetService. I wasn't surprised when this resulted in an error, seeing that video campaigns are generally not very well supported in the Adwords API—however, the error reason string given piqued my interest as it was not "OPERATION_NOT_PERMITTED_FOR_CAMPAIGN_TYPE" but rather "MUTATE_ACTION_NOT_PERMITTED_FOR_CLIENT".
Does this mean that there exist clients that are able to attach shared sets to video campaigns, or am I reading too much into this?
Thanks for any feedback and best regards,
Dorian