PowerShell: Checking Duplicating Identifiers Among ADFS Relying Party Trusts

function getDuplicatingIfd{
  write-host "Checking each relying party trust for any duplicates of identifiers..."
  $trusts=Get-AdfsRelyingPartyTrust
  $allTrustNames=$trusts.Name
  $duplicates=@()
  [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12 
  foreach ($trustName in $allTrustNames){
      write-host "Checking $trustName..." -NoNewline
      #$targetTrust=Get-AdfsRelyingPartyTrust $trustName
      $targetTrust=$trusts|?{$_.Name -eq $trustName}
      $metadataUrl=$targetTrust.MetadataUrl.AbsoluteUri
      try{
        $xml=Invoke-WebRequest -Uri $metadataUrl -Method:Get -ContentType "application/xml" -ErrorAction:Stop -TimeoutSec 60
      }catch{
        #write-warning $_
        $xml=$null
      }
      if($xml){
        $endPointReferences=([xml]$xml.Content).EntityDescriptor.RoleDescriptor.TargetScopes.EndpointReference|%{$_.Address}
     
        # $targetIdentifiers=$targetTrust.Identifier # This only returns the existing IFD's that may not have been synchronized
        # $otherTrustNames=$allTrustNames|?{$_ -ne $trustName}
        # $otherTrusts=Get-AdfsRelyingPartyTrust $otherTrustNames
        $otherTrusts=$trusts|?{$_.Name -ne $trustName}
        $otherIdentifiers=$otherTrusts.Identifier
        #$duplicateIdentifiers=$targetIdentifiers|?{$_ -in $otherIdentifiers}
        $duplicateIdentifiers=$endPointReferences|?{$_ -in $otherIdentifiers}
        if($duplicateIdentifiers){
            write-host "$trustName has these duplicate identifiers"
            foreach ($duplicate in $duplicateIdentifiers){
                $duplicateTrust=$otherTrusts|?{$duplicate -in $_.Identifier}
                if($duplicateTrust){
                    write-host "$duplicate in '$trustName' and '$($duplicateTrust.Name)'"
                    $duplicates+=[PSCustomObject][ordered]@{
                      duplicateIdentifier=$duplicate;
                      offendingRelyingPartyTrust=$trustName;
                      defendingRelyingPartyTrust=$duplicateTrust.Name
                    }
                }
            }
        }else{
            write-host " no duplicates..."
        }
      }else{
        write-warning "$trustName is skipped."
      }
    sleep 1      
  }
  return $duplicates 
}

getDuplicatingIfd