We had a client using the Ads API to upload a batch of phone numbers for Custom Audiences who received the error code #U8i8 without any additional information. Cluster ID was 6006341262522. We also saw the error a while back during initial development and believe it might be somewhat transient even against the same file. Any hints on what this means?
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It means that your audience is empty, possibly because of malformed phone numbers. Have you normalized your phone numbers before uploading?
- Normalize the phone number by removing any symbols, letters, and any leading zeroes.
- Prefix the phone number by country code. E.g., add '1' for a US phone number.
Yi Huang
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