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Hi
On that page
wp-admin/admin.php?page=newsletter_mailjet_index
I get this error message:
Unable to create a webhook: 400 – { “ErrorInfo” : “”, “ErrorMessage” : “MJ18 A EventCallbackURL resource with value \”2|false\” for EventType|Backup already exists.”, “StatusCode” : 400 }
How to fix it ? And what does it mean ?
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