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I'm getting an error message uploading to Mailchimp - KH1734

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I'm getting an error message uploading to Mailchimp
 
Mailchimp no longer supports the old APIs used by previous Mail Designer versions. Please update to Mail Designer 365 1.7 or later to use the latest Mailchimp 3.0 API. Mail Designer 365 1.7 is included with all Mail Designer 365 plans, owners of previous Mail Designer versions can purchase an upgrade plan.
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KH1734 | Aug 13, 2025 | Link to this FAQ
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