ERR_BULK_OPERATION on HubSpot: Bulk operation failed. Root cause: The Salesforce Bulk API operation failed to complete. Common causes include records in the batch violating validation rules, the batch containing duplicate IDs, the operation exceeding Salesforce's daily bulk API limits, or the batch job timing out before all records were processed. Step 1: Reduce batch size. Process fewer records Step 2: Add delays. Space out operations Step 3: Retry failed items. Reprocess failures Step 4: Monitor progress. Track operation status