It's not possible to transfer digital purchases from one Nintendo Account to another. However, downloaded content isn't limited to the Nintendo Account that made the purchase. Anyone that uses the purchaser's primary console.First, you'll need to set up your Nintendo account as the primary account on your console. Then, anyone who uses your console as the secondary console can access the DLC you've purchased. However, remember the primary console can access the DLC offline, but the secondary must be online to verify the content.DLC only applies for the account that purchased it. The exception to this is Primary Console which allows all users on the same console to access digital purchases, including DLC. So for you to enjoy the DLC on the same console, no you do not need to buy the same digital content twice.

How to redownload DLC on Switch : Select the icon in the upper-right corner to access your Account Information. Highlight Redownload on the left side of the screen. A list of titles you've purchased will appear. Highlight the game you want to redownload and select the orange icon to begin downloading the game and any DLC for it that you have purchased.

Is DLC tied to switch or account

You will need to use your own Nintendo Account on your system to purchase the game or DLC for your console. If you want to play content purchased by other people, you must be playing on the primary console for their account. For more information, read How to Play Your Games Across Multiple Nintendo Switch Systems.

Is DLC tied to Nintendo Account : The DLC will only be available in-game for the Nintendo Account that is used to download it.

You will need to use your own Nintendo Account on your system to purchase the game or DLC for your console. If you want to play content purchased by other people, you must be playing on the primary console for their account. For more information, read How to Play Your Games Across Multiple Nintendo Switch Systems.

This means that the DLC has not been purchased on the system, or that this is not the primary console for the Nintendo Account that originally purchased the content.

Why can’t I redownload DLC on Switch

You can only redownload games using the Nintendo Account that was used to purchase the game. If a specific game or DLC item shows "Purchased" in Nintendo eShop but you are unable to redownload it, you may find our information on Software Displays "Purchased" in the Nintendo Switch eShop helpful.No. A purchase cannot be transferred from one platform to another and if you wish to play (for example) Cities: Skylines on your PC but you own it on your PS4, you need to buy it on PC.There's a possibility that the additional content hasn't been installed correctly on your Nintendo Switch console. Please follow the steps below to resolve this issue: Restart your Nintendo Switch console. Log out of the "Nintendo eShop" and then log in again.

Purchased DLC can generally be refunded within 14 days as long as you've played the base game for under two hours since buying the DLC. Remember that if you play a game after purchasing DLC for it, even if you don't interact with the DLC content directly, this playtime still applies to the two-hour rule.

Does DLC transfer between Epic and Steam : Steam and Epic:

If you are playing through Steam, you will not be able to access DLC owned through Epic.

Does DLC transfer Steam : For free to play games, DLC cannot be shared since all Steam users "own" the game. Any user may purchase, trade, earn, or otherwise acquire in-game content while playing a game, but in-game items cannot be shared between accounts. These items remain the property of the account that purchased or acquired them.

How do you refund DLC

PSA: You can refund pre-ordered DLC in the Support section of the game on Steam. Select the DLC in the list, and select "I purchased this by accident". You'll then be able to ask for a refund (got mine an hour after requesting it).

For free to play games, DLC cannot be shared since all Steam users "own" the game. Any user may purchase, trade, earn, or otherwise acquire in-game content while playing a game, but in-game items cannot be shared between accounts.DLC licenses do not transfer between platforms. If you plan on using the DLC on a specific platform, you will need to purchase it.

Can I refund DLC on Microsoft store : Digital goods like apps, games, add-on content, subscriptions, movies, TV shows, and books aren't returnable unless the offer for applicable law states that you're eligible for a refund. For detailed info about return and refund policies, see Microsoft Terms of Sale.