LSEG - Asset Tree by Child Returns blank

Please see the POST URI and Body below. The API call returns blank. Can someone please help identify what's worng?

https://az-emea-ent-f2.corrigo.com/api/v1/query/AssetTree

{
"QueryExpression": {
"Criteria": {
"Conditions": [
{
"PropertyName": "Id",
"Operator": "Equal",
"Values": [
51 //pass asset id fetch in Customer response
]
},
{
"PropertyName": "Child.ModelId",
"Operator": "Equal",
"Values": [
"5683"
]
}
],
"FilterOperator": "And"
},
"Distinct": true,
"PropertySet": {
"Properties": [
"",
"Child."
]
},
"Count": 10,
"FirstResultIndex": 0
}
}

Results:

{
"Entities": []
}