I am writing one script to exclude all SKUs otherthan recommended in policy for that i have written script where it looks all skus and add to policy waiver list if that sku not the file i am fetching, but when i doing PScustomobject its displaying duplicate ones, Anyhelp here is much appreciated

$exclusionsVM1 = @()
$skus = Get-Content ".Dseries.txt"

$subs = Get-AzSubscription 


foreach ($sub in $subs) {
    Set-AzContext -SubscriptionId $sub.Id  -WarningAction Ignore | Out-Null
    $vm = Get-AzVm
    foreach ($v in $vm) {
        if (($v.hardwareprofile.VmSize -match "Standard_D") -and ($v.hardwareprofile.VmSize -notin $skus)) {
            $WaiverlistVM1 = [PSCustomObject]@{
                VMname = $vm.Name
                scope  = $vm.Id 
            }    | ConvertTo-Json
        }
        $exclusionsVM1 += $WaiverlistVM1
    }
}
$exclusionsVM | Out-File ".D_waiverlistVM.txt"
$exclusionsVM.count

foreach ($exclusionVM in $exclusionsVM) {
    try {
        New-AzPolicyExemption -Name $exclusionVM.VMname -PolicyAssignment $Policy -Scope $exclusionVM.scope -ExemptionCategory Waiver
    }
    catch {
        Write-Host "Error while adding VM '$exclusionVM.VMname' to the exclusions" -ForegroundColor Red
    }
}