Would you turn on the debug log and double check if you can find log message "Start to describe streams **" and "Job ended. region **" for each interval? The log group name should be print out in those message.
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Is there any data in s3 bucket "OURBUCKET"? I think that's just empty bucket for listing purpose only. If so, you can just skip that folder either use whitelist or folder name filter in config page.
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