RE: error creating the campaign lifecycle.

[Google Ads API Forum Advisor]

Hi,

Thank you for reaching out to the Google Ads API support team. 

Please be informed that I have removed your response from the forums as it contains the PII information.

Based on the information provided, I understand that you are encountering CUSTOMER_ACQUISITION_MISSING_EXISTING_CUSTOMER_DEFINITION error while creating campaign life cycle goals using the Google Ads API. This error message indicates that to use the Customer Acquisition goal in a campaign, the CustomerLifecycleGoal.lifecycle_goal_customer_definition_settings.existing_user_lists field must include an active and accessible user list with more than 1,000 members in the Search or YouTube network. If your account’s conversion tracking is managed by a manager account, only that manager's Customer Lifecycle Goal will be applied. Additionally, ensure that the manager account shares audience segments with sub-accounts through continuous audience sharing. 

Upon reviewing your user lists in your Google Ads account (9437372372), I found that none of the audience segments currently have at least 1,000 active members in the YouTube or Search network. You can navigate and verify in your Google Ads account under this path: Login to your Google Ads account > Tools > Shared library > Audience Manager > Your data segments. Although you mentioned that you were able to save the Customer Acquisition goal in the Google Ads UI, this doesn't necessarily mean the goal has been fully applied. The interface still displays a warning indicating that at least one audience segment must contain 1,000 active members in the YouTube or Search network. The message to 'define your customer list' suggests that you need to add more members to your audience segment IDs in order to use the Customer Acquisition goal effectively. You can also see this warning under the 'Goals' section in the Google Ads UI. I would recommend to ensure that one or more audience segments in your Google Ads account have at least 1,000 active members before creating the campaign lifecycle goals to avoid encountering this error.

Thanks,
 

Google Ads API Team

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[2025-06-19 04:42:19Z GMT] This message is in relation to case "ref:!00D1U01174p.!500Ht01rfkTz:ref" (ADR-00314893)