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== U2F (Universal Second Factor) with Duo [[gp:2FA|2FA]] (Yubikey NEO and 4 only) ==
To use U2F on the yubikey, one must first enable U2F mode (only supported on NEO and 4). The U2F-only yubikey and the yubikey edge already supports U2F out of the box
From the yubikey [https://www.archlinux.org/packages/community/x86_64/yubikey-personalization/ personalization client] man page: