2fa on the switch activate fortnite?

A friend wants to activate 2fa, but unfortunately she doesn't know how to do it. Since I have no idea about the Nintendo Switch, I wanted to know if you might be able to help me further, I would be very happy and I'm sure you will too.

The 2FA in Fortnite is not activated via the switch but via the Epic Account website. From now on I would recommend you to google it.

OK thanks. How do you actually log into the epic games website with a nintendo account?

? Simply register with your Epic data. You created an Epic account when you first opened it. Register with it. And otherwise log on to Nintendo on me