Prasun, given the timing of our mutual interest in the pile of fail that is Duo, I'm guessing we may attend the same large midwestern university. If so, you are correct that helpdesk has no interest in enabling decent tokens.
All the same, I'd rather spend my energy trying to convince IT that they should enable token types that are based on public cryptographic routines combined in standard ways than on trying to reverse engineer the proprietary Duo token type so we can emulate it in FreeOTP. That's better for the school, and keeps FreeOTP from being in a position of trying to maintain compatibility with a proprietary application with no published specifications. (At least, none I have found yet.)