Dragon Ball FighterZ Limited Edition Code not working

I just recently bought Dragon Ball FighterZ for the Nintendo Switch. It comes with two codes for the SSGSS Goku and Vegeta and Super Butoden game.
But upon entering the code on the eshop, it prompts an error "The product associated with that code is not currently available".
I just realized that the game I have bought is the asian/Japan version and my account is set to US.
Is there a way or a workaround that I can do to use the code but still using my US Nintendo Account?
Best Answer
No, unfortunately DLC is always region-specific. This is true for all recent consoles, not just Nintendo.
For a PlayStation account, it's possible to create a new account for the DLC's region, after which you can then install and download the DLC. After that, you can switch back to your original account, and play the game (which is region-free) with the downloaded DLC.
However, I don't think this can work for Nintendo consoles, since they are always linked to a single Nintendo account (for as far as I know, at least). Therefore, it looks like are unfortunately out of luck, and cannot access the DLC with your current account/console.
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Why is FighterZ not working?
Usually the cause of the Dragon Ball FighterZ network issue can be either the Dragon Ball FighterZ problem or your computer problem. If the Dragon Ball FighterZ servers are down or under maintenance, you'll definitely see the error and can't continue playing the game.How do I install Dragon Ball FighterZ DLC?
You can also get access to the free DLC if you play the game through Xbox Game Pass. Source: Bandai Namco.How to Install Dragon Ball FighterZ Fitgirl Repack | Won't Start Fix + Multiplayer Fix 100%
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