Roland A-80 Touch-Velocity not working on any key
Doesn’t sound right - velocity is selected in groups of 8.
Download the Roland A-80 Service Notes form synthxl (A-80 Roland SERVICE MANUAL | SynthXL - Service & Repair Manual)
Then go into diagnostic mode and see if the velocity test works.
If it does then it works techically but is somhow, somewhere disabled or edited out.