Mailchimp Website Authentication Error
This issue occurs when you click Provide Consent on the Connections page and the redirect URL cannot be authenticated.
Update the Mailchimp redirect URL
Solution: Use this procedure to update the Mailchimp redirect URL.
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Open a web browser and browse to the Mailchimp web site (http://mailchimp.com).
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Click Log In.
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Enter your user name and password.
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Click Log In.
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Click your user name in the upper right corner and select Account.
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Click Extras and then select API keys.
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Click Register and Manage Your Apps.
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Click Edit on the application you want to update.
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Update the Redirect URI field.
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Click Update.
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Click your user name in the upper right corner and select Log Out.