It's the other way around, @Sylvain_Guiblain
The top keyboard row only work for a single digit numbers
Use the full number keypad, instead :
FYI, just tried it with 885, and had no issues, using my PC keyboard, to enter Cue #, while in Cue EDIT mode...
Make sure the focus is on the Command Bar (click it), in order to have PC keyboard input