Quick question about GC Messaging Webhook to ServiceNow 400

Quick question about the messaging:updated webhook failing to ingest into ServiceNow incident tables. The payload arrives at the MID server, but the REST message returns a 400 Bad Request on the sys_id field mapping.

Environment:

  • Genesys Cloud v2023.12
  • ServiceNow Madrid Patch 12
  • Data Action: HTTP Request

The JSON body matches the schema in the docs, yet ServiceNow rejects the conversation_id as an invalid GUID format. Is there a known transformation step required for messaging webhooks specifically?