I have programmed an ATV 4K to work with a URC MX780. I understand the process, weird and unintuitive and unnecessarily complicated as it is. All ATV functions on the MX780 are from AUX 917 code list. When I attempt to teach the SELECT button to the AppleTV, the progress bar moves about 1/4 of the way and stops. I taught the MX780 a different code, (Yamaha RXV467 Main Power) without success. I have repeats set at 2 and repeat while pressed "on." I've tried it "off" as well. I was hoping to find some sort of reset function so I could delete all the learned codes in the Apple TV and start over, but I haven't had any success doing that.

When I first programmed the 780, the SELECT button was sending out too many repeats, so every time it was pressed it repeated the action twice.

Any help will be greatly appreciated.