Why the Person details returns always empty ?

Can you help me. I'm doing the integration with our system but I'm getting the empty response when I trying getting_client_people API.

getting_client_people Response:

[]

But I getting the clientid when i do with getting_your_clients

 [
{
"ClientID": "9676b0557428faf215da6483e2ef3049",
"Name": "Tenmiles"
},
{
"ClientID": "d5518487dc0e9262e485daabe06c7b7f",
"Name": "xyz"
}
]

So the question is why I'm getting any response? Is that something I'm missing. ? Also note that Tenmiles client have email ID and I successfully delivered campaign also.

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