https://support.google.com/accounts/answer/185839?hl=en&co=GENIE.Platform%3DDesktop

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• Google Help for 2-Step Verification
• Turn on 2-Step Verification

Your account, username@..., is missing recovery info. If you’re locked out of your account, recovery info helps you get back in. Add recovery info.

Turn on 2-Step Verification

With 2-Step Verification (also known as two-factor authentication), you add an extra layer of security to your account in case your password is stolen. After you set up 2-Step Verification, you’ll sign in to your account in two steps using:

• Something you know, like your password
• Something you have, like your phone

Activate 2-Step Verification

1. Open your Google Account.
2. In the navigation panel, select Security.
3. Under “Signing in to Google,” select 2-Step Verification  Get started.
4. Follow the on-screen steps.

Your account, username@..., is associated with your work or school. If you can’t set up 2-Step Verification, contact your administrator.

Verify it’s you with a second step

After you turn on 2-Step Verification, you’ll need to complete a second step to verify it’s you when you sign in. To help protect your account, Google will request that you complete a specific second step.

Computer AndroidiPhone & iPad

Use Google prompts

We recommend you sign in with Google prompts. It's easier to tap a prompt than enter a verification code. Prompts can also help protect against SIM swap and other phone number-based hacks.

Google prompts are push notifications you’ll receive on:

• Android phones that are signed in to your Google Account 
• iPhones with the Smart Lock app , the Gmail app , or Google app  signed in to your Google Account

Based on the device and location info in the notification, you can: 

• Allow the sign in if you requested it by tapping Yes
• Block the sign-in if you didn’t request it by tapping No

For added security, Google may ask you for your PIN or other confirmation.

Use other verification methods

You can set up other verification methods in case you:

• Want increased protection against phishing
• Can’t get Google prompts
• Lose your phone

Use security keys to increase phishing protection

Use Google Authenticator or other verification code apps

Use a verification code from a text message or call

Use backup codes

Skip a second step on trusted devices

If you don't want to provide a second verification step each time you sign in on your computer or phone, check the box next to "Don't ask again on this computer.

Important: Only check this box on devices you regularly use and don't share with anyone else.