Secret key is responsible for generating 2FA tokens. It is created automatically, in a QR code or text string form, when 2FA is enabled for a service and used to connect to our app.
It must be kept private as it will generate the same codes for others and compromise your account if they obtain it.
In 2FAS Auth, it can be found on the edit screen of each service. 2FAS Auth hides it by default, but you can display it by touching the eye icon.
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