It is very convenient when you can connect to your game account from any device. Here we will talk about how to do it in Yu-Gi-Oh! Master Duel.
How To Link Accounts: Mobile Yu-Gi-Oh! Master Duel
The first thing you need to do is go to the Konami Web page and open the My Konami option then create an account.
Next, go to the game submenu and in the data transfer, check if the game is connected to the Konami account.
Then for the Nintendo switch, open the game and when the (press A) option appears, press the plus sign on your device.
Then, click Data Transfer. This will give you a QR code, scan the code and this will take you to a link where you will need to enter your username and password from your Steam.
This will connect your Nintendo switch to your Konami account.