Hello, I have had a Crossout account on Steam for several years and I would like to do 2-step authentication to be able to buy blocked items. I searched on the internet but I don’t understand anything. Can someone help me?
enable 2FA on your gaijin account
IIRC, you have to go into the settings menu somwhere, but it’s been so long I forgot how to do it 
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log into your gaijen account and press the button that says “enable two factor authentication”.
It should give you a QR code to scan. This will download Gaijen authenticator app to your phone and autofill the code to enable it.
There are some steps in there that it walks you through so I am not typing them here.
I never did anything with my phone… 
Because you didn’t choose to use the Gaijen app. I did. I can only speak from my experience, not yours.