Azure Policy API not supplying me with valid Non-Compliant Resource or Policies with PowerShell

# Login first with Connect-AzureRmAccount if not using Cloud Shell

$azContext = Get-AzureRmContext
$azProfile = [Microsoft.Azure.Commands.Common.Authentication.Abstractions.AzureRmProfileProvider]::Instance.Profile
$profileClient = New-Object -TypeName Microsoft.Azure.Commands.ResourceManager.Common.RMProfileClient -ArgumentList ($azProfile)
$token = $profileClient.AcquireAccessToken($azContext.Subscription.TenantId)
$authHeader = @{
    'Content-Type'='application/json'
    'Authorization'='Bearer ' + $token.AccessToken
}

# Define the REST API to communicate with
# Use double quotes for $restUri as some endpoints take strings passed in single quotes
$restUri = "https://management.azure.com/subscriptions/{subscriptionId}/providers/Microsoft.PolicyInsights/policyStates/latest/summarize?api-version=2018-04-04"

# Invoke the REST API
$response = Invoke-RestMethod -Uri $restUri -Method POST -Headers $authHeader

# View the response object (as JSON)
$response

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$result = Invoke-RestMethod -Uri https://login.microsoftonline.com/$TENANTID/oauth2/token?api-version=1.0 -Method Post -Body @{
  'grant_type'  = 'client_credentials'
  'resource'    = 'https://management.core.windows.net/'
  'client_id'   = "$APPID"
  'client_secret' = "$PASSWORD"
}
$token = $result.access_token

#Sets CSS
$Css = '<style>table{margin:auto; width:98%}
  body{background-color:#fffffF    ; text-align:Center; font-family: Calibri ;}
  p,h2{text-align:Center; font-family: Calibri ;}
  h1 {text-align:Center; font-family: Circular Pro Black; font-weight: bold; color:#464958
  ;  }
  th{background-color:#464958; color:white;}
td{background-color:lightgrey; color:#464958  ; Text-align:Center;} </style>'

##set subscriptionId

$subscriptionId= @('0000000000000000000000', '0000000000000000000000', '0000000000000000000')


$PolicyResults = @()
ForEach ($subid in $subscriptionId)

{

    $Headers = @{
        'authorization' = "Bearer $token"
        'host'          = 'management.azure.com'
        'contentype'    = 'application/json'
    }


    $url = "https://management.azure.com/subscriptions/$subid/providers/Microsoft.Authorization/policyAssignments?api-version=2017-06-01-preview"


    $policies = Invoke-RestMethod  -Uri $url  -Headers $Headers -Method Get

ForEach ($policy in $policies.value) {

    $id = $policy.name
    $resources = "https://management.azure.com/subscriptions/$subid/providers/Microsoft.Authorization/policyDefinitions/$id/providers/Microsoft.PolicyInsights/policyStates/latest/summarize?api-version=2018-04-04"


    $a = Invoke-RestMethod  -Uri $resources  -Headers $Headers -Method Post

    ForEach ($value in $a.value)
    {
        $PolicyResults += [pscustomobject]@{
            'Policy Name' = ($policy.properties.displayName)
            'Policy Description' = ($policy.properties.description)
            'Non Compliant Resources'  = ($value.Results.NonCompliantResources)
            'Non Compliant Policies' = ($value.Results.NonCompliantPolicies)
        }
    }


}
}

$PolicyResults  | ConvertTo-HTML -head "$css <H1> Microsoft Azure Policy Report</H1>" -Title 'Microsoft Azure Policy Report'  | Out-File -FilePath C:\temp\AzurePolicy.html

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$a = Invoke-RestMethod  -Uri $resources  -Headers $Headers -Method Post

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