An error occurred when trying to update for SAPPHIRE Nation Newsletter opt-in!string(369) "{"type":"http://developer.mailchimp.com/documentation/mailchimp/guides/error-glossary/","title":"Invalid Resource","status":400,"detail":"The resource submitted could not be validated. For field-specific details, see the 'errors' array.","instance":"d2118ef5-2cd8-43fc-b4e3-0cf979e41228","errors":[{"field":"email_address","message":"This value should not be blank."}]}"
Mailchimp response code: 400
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