Powershell Hashtable Key False

$alldata

Name                           Value                                                                         
----                           -----                                                                         
@{serviceName=TRAINING {Count, Status, Ordered, Modified...}                                         
@{serviceName=TRN {Count, Status, Ordered, Modified...}                                         
@{serviceName=ad_test {Count, Status, Ordered, Modified...}

$alldata.ContainsKey("ad_test")  

$alldata.Keys | %{

    write-host $_.serviceName

    if ($_.serviceName -like "ad_test"){  
        write-host "enthält"  
    }else{
        write-host "enthält NICHT"  
    }
}