Sending JSON data as body element using POST method in Azure Function Powersell

Question

I am creating Powershell azure function with the HTTP trigger. I am using the POST method and sending body requests as Object Array(JSON) in the Azure function(Test Environment). But I can not read, and request body data and I get 400 Bad Requests!

The request body in Azure function is:

{
    "command": "GetUsersInGroup",
    "add": [{"LoginName":"Test","Group":"TEst2"}]
}

Powershell Code in the Azure function Powershell

 $adds = $Request.Body.add
         write-Host "Request===>" $adds
         $users = $adds | ConvertFrom-Json