I lost the phone my authenticator app was on. How do I get in?

Use one of the recovery codes you saved when you set the authenticator up. At the sign-in screen choose “Use a recovery code” and type it in — each one works once. Once you are back in, go to Settings → Security, turn the authenticator off and set it up again on your new phone, then generate a fresh set of recovery codes.

From the guide Account Security: SSO, 2FA & Passkeys.

Using an authenticator app

An authenticator app — Google Authenticator, Authy, 1Password, or any app that supports standard 6-digit codes — is the strongest second factor Seayora offers that does not need the Seayora app installed. The codes are generated on your phone and are never sent anywhere, so there is nothing for somebody to intercept from your inbox.

Go to Settings → Security, find “Authenticator app” and choose Set up. Scan the QR code with your authenticator app (or type the key underneath it), then enter the 6-digit code it shows to confirm the two are talking to each other. From then on, signing in on a new device asks for a code from the app instead of emailing you one.

Read the whole guide: Account Security: SSO, 2FA & Passkeys

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