If your Fediverse login is unavailable, you can choose FediID sign-in with an email address that is already verified and enabled for login. A link is sent to that address. A new, unverified address cannot retrospectively replace lost access.
If your second factor is missing
At the security challenge, choose another registered authenticator, an available email factor or an unused recovery code. Recovery codes are shown after setting up 2FA. Keep them separate from your device. Each code works once; generating new codes replaces the old ones. Email sign-in alone does not waive a required second check.
If no method is available
Automatic recovery is not guaranteed in this case. After checking your entitlement, an authorised operator can initiate a 2FA reset through protected administration. This is not a public function or a substitute for evidence that you own the account. Use an already-known operator contact. Never share one-time codes, recovery codes or secret keys. Security methods must be set up again after a reset.