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  • Google prompts - (Google default and it happens on any "eligible phone" you are signed into your Google Account)
    • Could be multiple devices
  • Voice or text message (multiple phone types - can't use Google voice)
  • Backup codes - (requires a printed copy of codes)
  • Authenticator app - (requires smart phone)
  • Security key - (requires purchasing a key - yubikey is the most famous - - also available on Amazon)

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