The column name is LabelNames
instead of Labels
. Also its type is StringSet, not String, so you should use .withCondition("LabelNames CONTAINS_ANY ['Active Clients']")
. However, "LabelNames" is not an available column for AccountSelector conditions yet (https://developers.google.com/adwords/scripts/docs/reference/mccapp/mccapp_accountselector#withCondition_1), hope this will change by time.
Anyway, I recommend to create a new MCC, where you keep only active clients, so you can place the script there without using withCondition
.