Hi Brian,
Thanks for reaching out to us.
Kindly note that the Customer Match and other user lists cannot be used in test accounts since user lists are not supported in test accounts and will automatically close upon creation. They can only be used in production accounts. Also, Customer Match is an allowlisted feature. Certain requirements must be met before it can be used. Please see this page for more details on requirements.
Let us know if you have any further questions.
Regards,
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| Yasar |
| Google Ads API Team |
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