Data Action POST 502 Bad Gateway on AU-1 BYOC

I can’t seem to figure out why the custom data action POST /api/v2/integrations/data-actions/:id/invoke returns 502 Bad Gateway.

Environment is AU-1 BYOC. Provider genesyscloud v1.22.0.

The flow works in Architect UI but fails in Terraform CI pipeline.

Request payload is valid JSON. Timeout set to 30s.