Some campaign does not have spent report by markerplace audiences

Hello,

We noticed that some campaign does not have spent report by markerplace audiences (aka user segements)

For example this campaign is running and spending
https://backstage.taboola.com/backstage/api/1.0/hooch-sc/reports/campaign-summary/dimensions/day?campaign=4630143&start_date=2020-05-24&end_date=2020-06-24
Results": [ { ... lot of numbers ... }]

https://backstage.taboola.com/backstage/api/1.0/hooch-sc/reports/campaign-summary/dimensions/user_segment_breakdown?campaign=4630143&start_date=2020-05-24&end_date=2020-06-24
"results": [],
"recordCount": 0,

Yet for this campaign we can get marketplace re[ort:
https://backstage.taboola.com/backstage/api/1.0/hooch-sc/reports/campaign-summary/dimensions/user_segment_breakdown?campaign=4510509&start_date=2020-05-24&end_date=2020-06-24

I tried different dates range. So far I can't find an explanation why some spending campaigns have marketplace data and some not: seems not to be connected to having audiences, age, etc
More examples of campaigns without marketplace data (from the same advertiser): 4437436 4630143 4469611 - about 20% of spending campaigns are missing

Taboola UI also does not show "by audience" data.

We are starting audience research project and have data from all campaigns or understand why some does not have marketplace data will be great.

Thanks,
Misha