1) Did you install the ASIO drivers provided by Mytek? If not, you'll probably need them to get DoP working.
2) If you did install the drivers, did you go to MC's Options > Audio and select the Mytek DAC's ASIO output under Audio Device?
3) If you did select the ASIO Mytek output, did you click on Device settings and enable the DSD bitstream in DoP format option?
Doing a quick glance at the DAC's specs, looks like it supports DSD via DoP and its ASIO drivers.
P.S. How is the Mytek connected, via USB?