+1 to the other ideas on this thread. * Using SMS isn't that great. * Using TOTP (Google or Microsoft Authenticator) is the current standard and should be the minimum. * Using a USB device that supports Yubikey OTP, would be a step better. * Using a USB device that supports U2F would be another step better, though this is a more modern standard, but isn't tied to a specific manufacturer. Newer Yubico devices support this.
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