problem in symmetric shaft with bending moment

hi everyone, 

i'm a new user of ansys academic 19 and i have some issues with a stepped shaft for evaluating kt (stress concentration)

i've divided the shaft and i've only 1/4 of the shaft, then i put the symmetry and antisymmetry constrains with displacement (1 and 2) and i put the bending moment on a side of the shaft and a fixed support at the another side

when i run the code the results are very strange for the phisics of the problem, so i'm obviously doing some mistakes that i don't see

can you help me?

thanks!

ps. there are some attached images. don't look at the mesh, i have to refine it

files

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