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Duo supports TOTP and U2F, it also supports now touchID on new Macs which makes it fairly easy to use.

I can get that the phone part is annoying but DuoPosh/TOTP and now the TouchID are probably the smoothest FMA solution for the enterprise I ever used.

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It doesn't support these at my institution. Maybe they haven't rolled out this version? (Technically you can get U2F to work, but they have a bright red warning that says it's unsupported when you do that.)

IT admins at your org can enable or disable 2FA methods allowed via the Duo administration console. Many US edus disable TOTP.

I think because they don’t want to deal with supporting the app and (almost) everyone has a phone that can receive calls.

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