Outbound API 400 Error: Legal Hold Metadata Conflict in Bulk Campaign Export

I’m completely stumped as to why the Genesys Cloud Outbound API is rejecting my bulk campaign export requests with a 400 Bad Request error. The issue occurs specifically when I attempt to include legal_hold_id metadata in the disposition payload for predictive dialing campaigns. This is critical for our EU-1 discovery requests, where chain of custody must be preserved from the moment the call is initiated. The error response cites “Invalid structure for custom disposition codes” but the payload schema matches the documentation for version 2023-10-01.

The environment uses the Python SDK v1.12.0 against the EU-1 region endpoint. We are running a scheduled job via AWS Lambda that triggers a Data Action to push recording metadata to S3. The failure happens at the API layer before the recording is even generated. I have verified that the legal_hold_id field is correctly formatted as a string and does not exceed the 64-character limit. The audit trail shows the request reaches the Genesys endpoint but is immediately rejected by the validation layer.

Previous attempts to isolate the variable suggest the conflict arises when the campaign status is set to ‘Active’ during the metadata injection. If I pause the campaign, the export succeeds, but this breaks our real-time discovery workflow. We need the metadata attached at the point of contact to ensure compliance with GDPR retention policies. The error log provides no stack trace, only the generic 400 code and the message about disposition codes.

Has anyone encountered similar validation conflicts when merging legal hold tags with outbound campaign exports? I suspect there is a hidden constraint in the bulk operation handler that prevents metadata modification on active predictive campaigns. Any insights into the specific payload structure required for this use case would be appreciated. We are currently blocked on a high-priority legal request and need a workaround or a fix for the API validation logic.

This is a classic case of trying to force Zendesk’s flexible ticket tagging logic into Genesys Cloud’s stricter Outbound data model. In Zendesk, we could just slap a custom field on any ticket and it would stick, but Genesys Cloud Outbound requires a much more rigid structure for disposition codes and associated metadata. The 400 error usually means the payload schema doesn’t match what the API expects for legal_hold_id. It is not just a simple key-value pair; it needs to be nested correctly within the disposition object or passed as a specific interaction attribute depending on your campaign type. I had a similar struggle when moving our compliance workflows over. The trick is to ensure the legal_hold_id is mapped as a string within the correct JSON structure, not as a separate top-level field. Try wrapping it in the metadata object like this: {"disposition_code": "SURVEY_COMPLETE", "metadata": {"legal_hold_id": "12345"}}. Also, double-check that your custom disposition codes in the Outbound admin panel are actually configured to accept this metadata type. If you just copy-paste the Zendesk JSON, it will fail because Genesys Cloud validates the schema against the specific disposition code definition. It is frustrating at first, but once you align the structure, the bulk export works smoothly. Keep in mind that EU-1 regions might have slightly different validation rules, so verify your tenant settings too. This strictness is actually a good thing for data integrity, even if it feels like more work initially compared to the old system.

The main issue here is that the payload schema for bulk exports doesn’t support nested legal hold metadata in the disposition object.

{
 "dispositionCodeId": "string",
 "legalHoldId": "string" 
}

Check the v2/outbound/campaigns/bulkexport schema for the correct flat structure.