Yes, you need a USB keyboard. It was mentioned in the TWAB a while back.
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https://www.bungie.net/en/Explore/Detail/News/50864 ok i see it this is dumb though, let me get a 20ft USB cable so i can use it from my recliner, makes sense it says you can enable chat window by "pressing enter" -- there's zero buttons on a controller they could bind to enable the same chat window? please
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I’d imagine they just thought it wasn’t very intuitive to bring up a digital QWERTY board to type via controller.