Any way to get Yubikey NFC to work on mobile?

Am using a Yubikey to login, works great on desktop, but on mobile I need to use alternative even though I have the 5nfc Yubikey.

The plugin uses the first version of FIDO U2F so that should work over NFC as long as the browser/device supports it.

It also breaks the WordPress app on iOS from working…

Could you please elaborate on this?

The Two-Factor plugin will disable all API requests that use password based authentication, including the REST and XML-RPC APIs, for users that have at least one two-factor method enabled. You can disable this feature by setting the two_factor_user_api_login_enable filter to return true like so:

add_filter( 'two_factor_user_api_login_enable', '__return_true' );