With Standardthe standard electrode potential assumed to be -0.358 V$\pu{-0.358 V}$, I am getting the same answer as you but I googled out for the standard electrode potential of the above reaction and I found it to be -0.320 V$\pu{-0.320 V}$. On substituting -0.320 V$\pu{-0.320 V}$ as the standard electrode potential, I got -0.529 V$\pu{-0.529 V}$.