Twitter has had two-factor security based on physical keys, like the Yubikey or Google's Titan keys, for a long time. You've been able to log in with said keys on your phone (assuming your key works with your phone) for a few months. But what if you have to manage your company's PR Twitter account while on the go? Or more typically, what if you have a USB-A key for your desktop and an NFC key for mobile usage?
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