Predictive dialer campaign returns 400 Bad Request on contact list upload with mismatched partition keys

General Discussion
1

How do I set up the entire outbound dialing stack without breaking the routing state? Trying to learn queue config, IVR logic, schedule overrides, and campaign routing all at once. It’s drowning me in steps. The contact list upload keeps failing with a 400 error when pushing through the /v2/outbound/contactlists endpoint. Console throws a partition_key validation failure. Payload matches the schema exactly though.

  • Genesys Cloud v24.4.0
  • Python SDK 2.48.0
  • Campaign set to predictive mode, 20-agent pool
  • Contact list contains 5k records, all with partition_key set to outbound-campaign-01
  • Flow configured with outbound dialer action pointing to the same campaign ID

The docs keep shifting on how the partition key actually syncs with the flow variables. Someone posted earlier that you can skip the partition_key field entirely if the campaign uses a static list, but that’s not accurate for predictive mode. The routing engine still expects a matching key to bind the contact record to the flow context.

Payload looks like this:
{
“name”: “Q3_Cold_Outreach”,
“description”: “Initial outreach batch”,
“partition_key”: “outbound-campaign-01”,
“contact_fields”: [
{“name”: “phone_number”, “data_type”: “string”},
{“name”: “first_name”, “data_type”: “string”}
],
“contacts”: [
{“data”: {“phone_number”: “+15550199822”, “first_name”: “Marcus”}},
{“data”: {“phone_number”: “+15550199823”, “first_name”: “Elena”}}
]
}

Response comes back immediately:
{
“message”: “Contact list validation failed. Partition key ‘outbound-campaign-01’ does not match campaign routing configuration.”,
“status”: 400
}

Already tried wiping the campaign, recreating the queue, and resetting the flow deployment. Dialer metrics stay flat. Queue just sits idle waiting for a contact that never routes. Schedules are locked to ET business hours, so that’s not the blocker. Mic stays hot during test calls but the outbound trigger never fires.

How do I actually tie the contact list partition to the campaign routing without breaking the flow variable mapping? The documentation jumps between legacy REST examples and the new architect canvas without showing the full chain. Just trying to get predictive dialing running alongside the existing inbound queue setup. Every config change seems to cascade into another permission error or schema mismatch.

Waiting on the next batch to queue up.

2
  • Problem: The partition key validation fails on /v2/outbound/contactlists because the SDK expects a nested object, not a flat string. It’s weird how the outbound engine throws a 400 on that. You’re probably missing the wrapper.
  • Code: Swap the string for a dict in your python call:
body=OutboundContactListRequest(
name="test_list",
partition_key={"type": "hash", "value": "camp_a"}
)
  • Error: Passing partition_key="camp_a" directly triggers that exact 400. The schema enforces the object structure. I’ve seen this exact mismatch in architect data actions too.
  • Question: Have you inspected the raw payload before it ships? Try these fixes:
  • Swap the flat string for the dict structure above
  • Verify your scope includes outbound:contactlist:write
  • Check the key length against the 32-character limit
  • Run a Postman dry run to isolate SDK serialization
    Just swap it and see if the 400 clears.
3 
# Verify partition key matches campaign settings before bulk upload
campaign = platformClient.outbound.getCampaign(campaignId)
if campaign.partitionKey.value != "your_expected_hash":
 raise ValueError("Partition key mismatch will orphan these contacts.")

The suggestion above stops the 400, but you’ll hit a silent failure next. Testing with the nested object structure worked locally. It failed in production because the campaign was still set to random. The outbound engine doesn’t complain if the partition key exists but doesn’t match the campaign configuration. Contacts just sit in the list and never get selected for predictive dialing. You’ll burn through your license count on dead records. Check your campaign settings. Using hash or random matters. The value inside that object has to match exactly. Also, watch the webhook notifications. If the upload succeeds but the campaign is misaligned, you get a success event that masks the routing issue. What campaign ID are you targeting? The partition key validation is strict. Miss it and the contacts never dial. Verify the key type matches the campaign definition before pushing the payload.