ERR_WORKFLOW_RULE on HubSpot: Workflow rule execution failed. Root cause: A Salesforce Workflow Rule or Process Builder automation is conflicting with the operation being performed via API. The workflow rule may be updating the same fields being written by the API call, triggering validation errors, or causing a recursive loop that exceeds Salesforce's governor limits. Step 1: Review rule conditions. Check trigger logic Step 2: Verify actions. Check action configuration Step 3: Test with sample. Manually trigger rule Step 4: Check logs. Review execution logs