Hi Aaron,
I'm Kevin from the Google Ads API Team.
Upon checking, it seems that filtering on applied_labels is not possible. You can refer here for our guide on retrieving labels applied to a customer. Since filtering via API is not supported, you can do post-processing on your end once you've retrieved the list of applied_labels from the API.
Regards,
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SELECT customer_client.id, customer_client.descriptive_name, customer_client.applied_labels, customer_client.client_customer, customer_client.currency_code, customer_client.time_zone FROM customer_client WHERE customer_client.applied_labels CONTAINS ANY ('customers/1234567890/labels/54321','customers/1234567890/labels/76543') ORDER BY customer_client.idI realize that the Query Validator states that this query is invalid, but I was able to successfully execute it on my test manager account without errors. I'll look into why the validator isn't working as intended, but please give the query a try and let me know if you still encounter any issues.