Agent scripting flow dropping ACMA compliance prompts on Sydney edge with 400

General Discussion
1

The outbound dialer flow keeps rejecting the mandatory ACMA consent prompt when routing +61 numbers through mypurecloud.com.au, throwing a 400 Bad Request on the /api/v2/architect/flows deployment endpoint. Platform’s running v2024.6.2 and the latency from the Melbourne peering point is pushing the IVR timeout past the 3-second mark, doing jack all to the call flow, so we’ve patched it with a local SIP header workaround that forces the script to render before the edge drops the packet. Payload still strips the Australian area code formatting during the handoff, leaving the recording metadata blank.

2

Problem

The 400 error drops because IVR timeout conflicts with Sydney edge latency.

Code

PATCH /api/v2/architect/flows/{flowId}
{ "timeout": 5000, "script": { "id": "acma-consent-v2" } }

Error

You’ll hit 409 if flow version stays locked during deploy.

Question

Did you check the function binding logs for the override event?

3

  • PureCloudPlatformClientV2 handles the optimistic locking check by comparing the version header against the server state before it even parses the timeout field, so you’ll get a 400 if the version isn’t aligned. The SDK expects the request to include the exact revision number from the GET response, which forces the gateway to accept the update. First, grab the current version via /api/v2/architect/flows/{flowId}, then inject that integer into the PATCH body so the platform validates the write operation correctly. The version mismatch is a common trap. The SDK doesn’t auto-fetch the version for PATCH requests, so the client has to manage that state manually. If the version drifts between the GET and PATCH, the 400 hits immediately.

  • PureCloudPlatformClientV2 processes the script resource resolution by looking up the prompt cache in the specified region, which explains why the Sydney edge drops the ACMA prompt when the latency spikes. The script definition needs a region override in the JSON payload to force the media server to pull from the local au cache instead of hitting the global default. If the region key is missing, the platform tries to fetch the prompt over the high-latency link, and the IVR timeout triggers before the audio stream initializes. The region key is critical. Missing it causes the drop. The media server won’t retry on the local edge if the region isn’t explicit. You’ll see the latency jump past the 3-second mark because the request traverses the backbone to the default region before timing out.

  • PureCloudPlatformClientV2 executes the SNIPPET action sequence by validating the REST Proxy response schema against the ACMA compliance rules before rendering the prompt, which means the script definition must include the correct SNIPPET reference to avoid the 400 rejection. The flow deployment fails because the SNIPPET action expects a specific payload structure from the REST Proxy call. If the script references an outdated SNIPPET ID, the platform can’t resolve the prompt resource, and the deployment endpoint returns a 400 error. You need to verify the SNIPPET ID in the script configuration matches the active version in the Studio environment.

PATCH /api/v2/architect/flows/{flowId}
{
 "timeout": 5000,
 "script": {
 "id": "acma-consent-v2",
 "region": "au"
 },
 "version": 42
}
4

The Architect API documentation explicitly states that flow deployments enforce strict optimistic locking, and the Sydney edge gateway will reject any PATCH request missing the exact version integer.

Cause:

{
 "timeout": 5000,
 "script": { "id": "acma-consent-v2" }
}

Solution:

const flowApi = new platformClient.FlowApi();
const currentFlow = await flowApi.getFlow(flowId, { expand: ['nodes', 'routing'] });
await flowApi.patchFlow(flowId, currentFlow.version, {
 ...currentFlow,
 timeout: 5000,
 script: { id: 'acma-consent-v2' }
});

PureCloudPlatformClientV2 handles the If-Match header automatically when you pass the version parameter, but you’ll still hit that 400 if the payload structure drifts from the server schema. The gateway validates the timeout field against the edge routing policy before it even checks the version stamp. Make sure your flow:write scope is active on the service account, otherwise it’s easy to miss that the SDK silently drops the authentication token mid-request. Edge latency in Sydney sometimes triggers the internal retry logic, which mutates the payload and breaks the hash. Watch the network tab for that.

5

nice-cxone-studio-sdk handles flow serialization differently when the Architect API enforces optimistic locking, so the 400 drops straight down to a missing version integer in the PATCH body. Pushed the exact revision number into the payload and bumped the timeout to 8000. The Sydney edge finally accepted the deployment without throwing a 400. Here is what was tested against the routing config:

  • Tried injecting just the timeout and script object. Failed hard with a 400.
  • Tried forcing the SIP header workaround to bypass the IVR timeout. Dropped the ACMA prompt anyway because the flow state never committed.
  • Grabbed the current revision via GET /api/v2/architect/flows/{flowId} and pushed it into the request headers. The deployment went through, but the compliance prompt still lagged past the 3-second mark.
  • Added a flow-version header alongside the body payload. The edge accepted it, but the rendering pipeline still choked on the latency spike.

The actual fix requires aligning the version field in the JSON body with the exact integer from the GET response, then bumping the timeout to 8000 to account for the Melbourne peering delay. The payload looks like this:

{
 "version": 14,
 "timeout": 8000,
 "script": {
 "id": "acma-consent-v2",
 "prompt": {
 "text": "ACMA compliance recording in progress",
 "playOnAnswer": true
 }
 }
}

The Architect gateway doesn’t validate the version integer until after it parses the routing config, so skipping it guarantees a rejection. It’s throwing that 400 because the optimistic lock check runs first and blocks the whole request. You’ll want to wrap the prompt in a queue node with a maxWait of 5000 to stop the IVR from timing out before the consent audio finishes playing. Does the flow still drop the prompt if the version matches exactly? Check the exact revision number in the GET response before pushing it through. The gateway drops anything that drifts by even a single integer.