If you forgot or lost your paired device or it is stolen, you might be able to authenticate using a backup device.
Use the Forgot your device? link to get a
If you are unable to access one of your paired devices, click Forgot your device? to see the backup devices available to you. The devices you can use depend on the information available in your organization's directory and can include your personal email or an alternative phone number.
The Forgot your device? link is only available if your organization has enabled this feature and there is a valid backup device for your account.