Can't you ask for a key fob OTP code generator device? Employees who work at sensitive client sites in many cases wouldn't be allowed to connect their phones to

Can't you ask for a key fob OTP code generator device? Employees who work at sensitive client sites in many cases wouldn't be allowed to connect their phones to the Internet and may have restrictions placed on the usage of it. A separate hardware key generator (which is really a second factor) could possibly help (depending on the situation and need).