How to Set Up Two-Factor Authentication On Coinbase with Duo Mobile. [BONUS CONTENT]

Open Coinbase account: https://www.coinbase.com/join/5a26f5cc7bccdd00e6127c03

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Coinbase help documents

Why am I being asked to change my second-factor method?
https://support.coinbase.com/customer/portal/articles/2814649

What two-step authentication apps can I use?
https://support.coinbase.com/customer/portal/articles/2821103