Workflow API AssistantOverrides

Hi, i am trying to submit to the VAPI api the following to create a campaign, for reference a recieve a code 200 and the campaign creates and i get the call but the voice overrides don't work. Is there any reason for this?
{
"name": "Final Test Campaign",
"phoneNumberId": "redacted",
"workflowId": "redacted",
"customers": [
{
"name": "Connor",
"number": "+44 redacted",
"externalId": "9e62212c-96c0-4715-bc17-db234a852c48-N01",
"assistantOverrides": {
"voice": {
"provider": "vapi",
"voiceId": "Paige",
"speed": 1
}
}
}
]
}
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