Trying to push dynamic ANI values into an outbound campaign via a custom SNIPPET, but the REST Proxy call to /api/v2/outbound/campaigns/{id}/contacts keeps throwing a 400 Bad Request. Studio runs on 24.3.1 in eu-west-1, so the regional latency isn’t the issue. The flow maps the CRM response correctly, but it’s dropping the phone field during JSON serialization. Endpoint just bails with: {"errorCode": "invalidContactFormat", "message": "Contact array missing required phone attribute"}