SFMC Journey Email Previews Sender

Error

I keep getting this error message when trying to use this extension. Any suggestions? 09:23:16 Error: Error: Fetch to https://content-builder.s7.marketingcloudapps.com/fuelapi/data-internal/v1/customObjectData/69c40d4a-3dde-ef11-a5d0-5cba2c702db8?showKey=true&$page=1&$pagesize=25 Failed