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404 Error in Production Support in Journey Builder Interactions

Knowledge Article Number 000213373
Learn why you received a 404 error when attempting to open Journey Builder in my Marketing Cloud Sandbox account. 
Journey Builder is not supported in the Sandbox environment, so it cannot be opened. If the URL for the account you're trying to access is "" then Journey Builder will not function and you'll receive an error. 

If you encounter this problem, please reach out to your Account Manager for further assistance. 

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