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.

1. Open a web browser and browse to the Mailchimp web site (http://mailchimp.com).

2. Click Log In.

3. Enter your user name and password.

4. Click Log In.

5. Click your user name in the upper right corner and select Account.

6. Click Extras and then select API keys.

7. Click Register and Manage Your Apps.

8. Click Edit on the application you want to update.

9. Update the Redirect URI field.

10. Click Update.

11. Click your user name in the upper right corner and select Log Out.

See Configure Connection Security.