ServiceNow Data Action 422 on Digital Channel Message Event

  • Genesys Cloud Org ID: 12345678-1234-1234-1234-123456789abc
  • ServiceNow Instance: London Prod
  • Data Action Version: 2.1
  • Trigger: Messaging Message Created Event

Trying to understand why the ServiceNow Data Action returns a 422 Unprocessable Entity when the conversation.participants array contains more than five entries. The payload validation passes in the architect sandbox, but the live webhook execution fails with invalid_grant on the ServiceNow side despite valid OAuth tokens. Is there a known limit on participant object depth for this integration?