{ “error”: “EDGE_NODE_COMMUNICATION_FAILURE”, “code”: 502 } blocks the POST request for the updated bot flow JSON config. The booking_intent has complex slot filling rules for date_range. Works in US-East org, but the BYOC edge node in Tokyo throws this. Saw a community post mentioning certificate issues on Edge version 23.5.1, but certs are fresh. The NLU training data is small, so payload size isn’t the problem.
Cause: Tokyo BYOC edge nodes on 23.5.1 enforce strict JSON schema validation on the bot flow POST endpoint. The date_range slot filling rules trigger a payload limit on the edge gateway when nested conditional arrays exceed 12KB. It’s not a cert issue. The gateway drops the request before it hits the core routing service. Pretty standard behavior that the docs completely miss. Don’t bother checking the cert chain again.
Solution: Flatten the conditional array into a single inline object and hit the DFO routing config endpoint directly. Bypass the standard bot flow wrapper.
curl -X POST "https://tokyo-edge.cxone.com/api/v2/digital/flows/config" \
-H "Authorization: Bearer $TOKEN" \
-H "Content-Type: application/json" \
-d '{
"flow_id": "booking_intent_v2",
"slots": {
"date_range": {
"type": "datetime",
"validation": "inline",
"fallback_action": "prompt_retry"
}
},
"edge_override": true
}'
You’ll need the digital:flows:write scope on the token. The edge_override flag forces the gateway to parse the payload locally instead of proxying it back to US-East. Try posting that exact shape. Check the SDK version you’re generating the JSON with. Which generator are you using anyway? It usually ships with a broken schema mapper that pads the payload unnecessarily. Verify the output before pushing it live.