This page works exactly once, then disables itself forever.
Three or four unrelated words beats a short complicated one. Nobody can reset this for you, so put it in your password manager now.
Open your authenticator app, choose to add an account by entering a setup key, and paste the key below. The account name is your email.
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Entering a working code here proves the app is set up before the account exists, so you can never be locked out of your own system.
Setup has already been completed on this installation.
Go to sign in.