Can't control SiTech Mount

Hi!
I am trying to setup my Mesu Mount 200 with SiTech II controller to operate under SGP. It will connect via POTH or directly via SiTech II telescope chooser. However, it will not operate the scope. No nudging, slews or plate solves. I think SGP is not talking to the ASCOM driver. Tried various combinations without success.
Any suggestions are greatly appreciated.
Ian