Note the following summary of the chat I had today with Amazon Customer Support.
Amazon Messaging Assistant | - Customer Service - What may I help you with? - madmacmo - Smart Plug setup. Have tried both bar code on device and on card from box, also manual setup without bar code. I get Provisioning Failure 3:12:400:3 every time right at the point when connecting the plug to WIFI. - Customer Service - is this with alexa device? - madmacmo - Yes, a brand new Amazon Smart Plug in a sealed unopened Amazon box, SN xxxxxxx on eBay. - Customer Service - Unfortunately we won't be able to as the device serial number is blacklisted as it is shown in our records to have been replaced. You will need to get in touch with the seller and ask the seller to contact us.
Please note before you buy an Amazon device on eBay you can always check with us first with the dsn number on the box.