So, you followed Pairing the Original Black OSMC RF Remote Control with a Pi/Vero2/4k/4k+.
Just to be sure: Connected with Windows 10 and doing the notepad test, the keys Home, OK, Up, Down, Left and Right do not show any effect?
If yes, as long as you can rule out strong interference, this HW combination (dongle + remote controller) looks defective.