Two-factor authentication (2FA) is a required security measure to confirm you are in control of your login credentials before signing-in to better secure your account. 2FA is a requirement and can not be disabled for your account.
At this time, we offer 2FA via Authy, SMS, and through hardware security keys through WebAuthn for logins. We will let our customers know if we decide to integrate any other form of verification for 2FA. If you have updated the phone number (or updated your mobile device) registered to your account, please take a look at this support article to regain access to your account: How do I use 2FA with my new phone device/number?
More details on 2FA security features can be found in our Gemini blogs:
Better Two-Factor Authentication (2FA)