The Authentication key is a 16-character key that can be used to set up 2FA for your account in the same way as scanning a QR code.
Please note that this key cannot be used as an authentication code.
When setting up 2FA for your GateHub account, the Authentication key should be saved in order to use it as a backup in case you lose access to your authenticator app.
For example: If you lose or break your phone you can set up your 2FA for your GateHub account on your new device by entering the authentication key manually to your new authentication app.
We advise you to store your authentication key in a safe place (offline storage or paper copy).
Read more about 2-Factor Authentication here.