string(346) "{"type":"https://mailchimp.com/developer/marketing/docs/errors/","title":"Invalid Resource","status":400,"detail":"The resource submitted could not be validated. For field-specific details, see the 'errors' array.","instance":"2b1aae80-d92f-65ac-a1cd-23e37289ad1f","errors":[{"field":"email_address","message":"This value should not be blank."}]}"
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