Using BigQuery for AdSense data - 403 Access Denied -

i've been using bigquery pull adsense data, queries have started failing, error:

(403) access denied: table google.com:adsense-reports:reports.dailycustomchannelreport: user not have permission query table in dataset google.com:adsense-reports:reports

here's sample query:

select matched_ad_requests, clicks, [google.com:adsense-reports:reports.dailycustomchannelreport] date between '2015-02-10' , '2015-02-11'and custom_channel_code 'test_18'

• these query failures aren't associated code change application. fail in bigquery browser tool- queries ran in past. seems rule out problem query.
• nothing has changed regards account access adsense. able log in dashboard , see data.

any ideas how can restore ability query data? thanks.

i got internal confirmation: adsense experiment bigquery discontinued. team tells me notified experiment users months ago, before disabling it.

sorry lack of better news!