C# Routing API optimize payload hitting 422 on workload score matrix validation

The atomic analysis call keeps bombing out with a 422 when we push the optimize payload. We’ve got a C# service handling automated routing assignments. It constructs the optimize payloads with agent ID references, workload score matrices, and preference weight directives. The validation pipeline runs skill match checking and availability window verification before the request goes out. We’re also tracking optimizing latency and assignment success rates for the queue metrics dashboards. The WFM callback handler waits for the atomic analysis to finish before triggering the automatic queue rebalance.

var optimizePayload = new {
 agentIds = new[] { "a1b2c3", "d4e5f6" },
 workloadScores = new Dictionary<string, double> { { "skill_a", 0.85 }, { "skill_b", 0.42 } },
 preferenceWeights = new { queue_priority = 0.6, agent_skill_match = 0.4 },
 constraints = new { maxOptimizationCycles = 15, enforceAvailabilityWindows = true }
};

var response = await httpClient.PostAsJsonAsync("/api/v2/routing/optimization", optimizePayload);

The routing engine rejects it on the second iteration. The format verification step seems fine locally. We generate optimizing audit logs for assignment governance and expose the assignment optimizer for automated Routing management. The 422 payload mentions maximum optimization cycle limits and routing engine constraints. Is the workload score matrix supposed to flatten into a list instead of a dictionary? Or does the preference weight directive need a specific namespace prefix? The audit logs show the payload passes our local schema check every time. Still stuck on why the optimize schema validation fails against the routing engine constraints. The payload structure looks identical to the docs.

The Routing API documentation states that workload score matrices require normalized decimal values between zero and one.

Problem

Passing integers like 100 triggers a 422 validation error on the /api/v2/routing/optimization/assignments endpoint.

{ "workloadScoreMatrix": { "agentId": "uuid", "score": 0.85 } }

Error

The server doesn’t accept unnormalized inputs during atomic analysis. Did you check your decimal formatting?

Problem

Score normalization looks right, but the Queue Configuration might be blocking the matrix format.

{ "score": 0.85, "agentId": "uuid" }

Error

You’ll hit a 422 if the Admin UI hasn’t enabled Workload Management for that queue. Verify the Queue Configuration directly in the UI before blasting the API again, is Workload Management actually turned on?

Problem

Matrix validation is stricter than bot intent uploads. Don’t push a nested object where the schema expects a flat map.

Code

{
 "workloadScoreMatrix": [
 { "agentId": "uuid", "score": 0.85 }
 ]
}

Error

You’ll get a 422 if the array wrapper is missing. I threw this at a test bot and it passed.

Question

Are you reusing the serializer from the NLU model call? That one needs different nesting.

{
 "routingQueueId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
 "workloadScoreMatrix": [
 { "agentId": "x9y8z7w6-v5u4-t3s2-r1q0-p9o8n7m6l5k4", "score": 0.75 }
 ],
 "preferenceWeights": { "skillMatch": 0.6, "availability": 0.4 }
}

The suggestion above nails it, but the real culprit in C# is usually the default JSON serializer wrapping that array in an extra object. Or dropping the leading zero on floats. You’ll get a 422 if the schema parser sees .75 instead of 0.75. Force the serializer to keep leading zeros and strip any parent wrappers before hitting /api/v2/routing/optimization/assignments. Also make sure your bearer token has routing:optimization:write or the gateway rejects the handshake before validation even runs. Running a similar webhook bridge for queue alerts required explicitly setting JsonSerializerSettings.FloatFormatHandling to avoid the truncation issue. Double check your queue’s workload management toggle in Admin too, cause the endpoint silently drops malformed matrices if it’s disabled. The latency spikes usually clear up once the payload shape matches the v2 spec exactly. Check the response headers if it still bombs.