NFC works fine with the Yubico authenticator app, IME. Using a Yubikey 4 NFC (USB A + NFC). USB-C works fine with the Yubico authenticator app, IME. Using a Yu

NFC works fine with the Yubico authenticator app, IME. Using a Yubikey 4 NFC (USB A + NFC). USB-C works fine with the Yubico authenticator app, IME. Using a Yubikey 5c. Haven't used the lighting one, as I don't have an iPhone. Probably fine. The one annoyance is that there's no USB-C + NFC key yet. Edit: on my old phone I also used a USB-OTG (Micro-B male to A female) adapter with a normal Yubikey4, which worked (but was an ugly kludge).