UnknownEntityTypeException in Create audit query execution API

Hi,
I am using Create audit query execution api POST /v2/audits/query
Request:
{
"interval": "2020-08-25T00:00:00/2020-08-25T23:59:59",
"serviceName": "ContactCenter",
"filters": [
{
"property": "EntityType",
"value": "Campaign"
},
{
"property": "Action",
"value": "Recycle"
}
],
"sort": [
{
"name": "Timestamp",
"sortOrder": "ascending"
}
]
}

Response:
{

    "message": "UnknownEntityTypeException [Campaign]",

    "code": "not.found",

    "status": 404,

    "messageParams": {},

    "contextId": "0c2a8f76-8ec5-45ab-84fc-c93265a20d87",

    "details": [],

    "errors": []

}

I can see EntityType as Campaign in search Audit, yet I am getting the error.
Can you please help?