2FA or 'two-factor authentication' allows you an additional security step when logging into your account, withdrawing funds from your NiceHash wallet, or placing a new order. You can enable it in your settings. Each of these three actions has its own 2FA code so you will have to set them up separately.
Unset key and QR code are changing with each website refresh, so once the page is loaded, scan the code and set it up.
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