Scenario:
Receiver connected to fixed dish = works fine.
Receiver connected to motorised dish = does not work
Conclusion:
Nothing wrong with tuner.
Possible issues:
1. User error in configuration of tuner. Post a screenshot of your tuner configuration
2a. If configuration is correct, maybe an issue with the motor itself. Does it move when you control it with the receiver?
2b. Maybe the dish is not aligned correctly.