Java Web Messaging bot handoff dropping CONTEXT_PRESERVATION on Conversations API transfer

InteractionEvent event = eventStream.poll();
if (event.getEventType().equals("BOT_ESCALATION_TRIGGER")) {
 Map<String, Object> handoffPayload = new HashMap<>();
 handoffPayload.put("conversationHistory", event.getMessages().stream().limit(50).collect(Collectors.toList()));
 handoffPayload.put("metadata", event.getAttributes());
 handoffPayload.put("QUEUE_ASSIGNMENT", "L2_SUPPORT_SKILL");
 
 conversationsApi.modifyConversationInteraction(conversationId, interactionId, handoffPayload);
}

The transfer hits /api/v2/conversations/webmessaging/{conversationId}/interactions/{interactionId} but returns a 409 CONFLICT. Prefer routing through ARCHITECT_FLOW over direct SDK calls, but the bot escalation bypasses the standard path. It’s throwing a conflict error even though the routing rules are clear. Agent routing proceeds regardless. Guest session clears immediately. We’ve verified the CONTEXT_PRESERVATION flag within the ARCHITECT_FLOW configuration. Payload structure appears correct locally. Message history drops during the INTERACTION_OWNERSHIP swap. Don’t observe any validation errors in the response body.

Here is the MESSAGE_INJECTION attempt for the guest notification:

try {
 messageApi.postMessages(conversationId, new MessageRequest()
 .text("An agent will be with you shortly. HANDOFF_TIMEOUT is set to 120s.")
 .from(new MessageSender().type("system")));
} catch (ApiException e) {
 logger.error("Message injection failed", e);
 executeFallbackLogic(interactionId);
}

We’ve tried adjusting the payload keys and switching to the PATCH method. The skill routing works fine on the queue side. Just the transfer step breaks. Environment specs and attempted fixes:

• Genesys Cloud Java SDK 12.8.0
• Web Messaging channel configured with BOT_ESCALATION_TRIGGER enabled
• Payload sent as application/json with explicit X-Genesys-Request-Id
• Verified agent skill profile matches QUEUE_ASSIGNMENT
• Tested with preserveContext: true in the interaction properties
• Added manual metric logging via /api/v2/analytics/conversations/details/query

The ownership transfer completes, but the guest sees a blank chat window. The interaction events stop firing after the handoff. We need the history to carry over so the agent can see the previous bot exchanges. The analytics query just returns empty rows for the handoff duration.

You’re dropping the handoff because the CONTEXT_PRESERVATION flag isn’t actually bound to the request body. Architect flows handle this routing natively, but if you’re pushing through the API, you’ll need to explicitly set the TRANSFER_CONFIG attributes. Skip the QUEUE_ASSIGNMENT override and it’ll default to unassigned.

modifyRequest.setPreserveContext(true);
modifyRequest.setRoutingStrategy("SKILL_BASED");

You’ll hit a 400 Bad Request error InvalidTransferConfiguration if the routing object isn’t fully instantiated before the API call. The suggestion above covers the boolean flag, but you’re ignoring how the mobile client handles the state transition. The Web Messaging SDK expects the RoutingData to carry the queue ID explicitly; otherwise, the session hangs on the device when the bot drops. You need to wrap that preserve flag inside the routing structure. Don’t rely on implicit defaults for the queue assignment. The SDK won’t reconnect properly if the context metadata is missing from the routing payload. It’s a common trap when migrating to API-driven handoffs.

RoutingData routingData = new RoutingData();
routingData.setPreserveContext(true);
routingData.setQueueId("YOUR_QUEUE_ID");

modifyRequest.setRouting(routingData);
conversationsApi.modifyConversationInteract(
 new ModifyConversationInteractRequest()
 .conversationId(event.getConversationId())
 .body(modifyRequest)
);

The TRANSFER_CONFIG adjustment resolved the handoff drop. After updating the deployment snippet to include the explicit queue ID, the JavaScript messenger SDK stopped stripping the custom attributes during the bot-to-agent transfer. The widget CSS classes shift a bit when the state changes, but the session data doesn’t drop anymore. Found a similar workaround in an older community post regarding the customization API, which pointed toward the routing object structure being the main culprit. Looks clean.

The conversation lifecycle events are firing as expected now that the routing object is fully instantiated. The CONTEXT_PRESERVATION flag remains active through the transition, so the agent sees the full history. Deployment validation passed on the first try after removing the nested array in the metadata block. Analytics bucketing verification is still pending.