Hi Meri,
Thanks for reaching out to the Google Ads API Forum.
Kindly see below responses to your queries:
What means if user interest Availabilities list is empty?
>> Kindly note that some UserInterest options are only available for specific campaign types. By default a new campaign will not contain user interest criteria. Only negative criteria are supported at the campaign level. You may use user_interest report, and user_interest_query_builder to construct the query. Also, as per this guide, AdGroupCriterionService used to create a UserInterestInfo that will contain the details of the user_interest_category.
It means that user interest supports all campaign types OR all campaign types?
>> You may need to use the UserInterest availabilities attribute to check the availability based on context.
Regards,
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