It stopped working for me after the stellarmate update.
Then I did the firmware update (hoping to fix it), but the calibration fails.
After a calibration with the primalucelab program (play under windows 10) the focuser moves without errors even in ekos (I dont' have tried the calibration under ekos after calibration under windows)
Maybe a bit late but I ran into the same problem. Updated my Sesto Senso 2 firmware using the Primaluce Play software (on windows). Works well now on my Stellarmate and Indi drivers.