When redeeming a code that you already own it will still use that code. It is the buyer’s responsibility to know what movies are in their library. No refunds are given for codes that you have redeemed and already own. PLEASE make sure you do not buy a code you already have in your library.
(MA/4k) codes MUST be redeemed at moviesanywhere.com for 4k redemption. They will most likely not transfer to Vudu in 4k. They will only transfer in HD. No refunds for (MA/4k) codes redeemed anywhere but moviesanywhere.com or because they didn't transfer to Vudu in 4k.