4th Axis - no motion

 I have connected my 4th Axis module, checked the jumper settings, and I know it is getting power as the spindle cannot be turned when connected. However, when I try to step the Axis in UcCNC nothing happens. Are there any changes I need to make to the UcCNC settings, or is there any support documents I have missed with troubleshooting information?

I have tried with and without Axis is rotary selected.