MuseScore 3 doesn't work with azerty keyboard
MuseScore uses digits for several essential commands, mainly note length choice.
Using digits with azerty keyboard, especially without numeric keypad as it is more and more often the case on modern laptops is clumsy.
But thanks God MuseScore has always been very smart on that subject, allowing you to use the digits key without needing to add the shift command.
To be clear:
The key with a [ ' ] and a [ 4 ] could be used without shift key and was considered entering a 4. even if the "true" character was [ ' ].
It has always worked for me on azerty keyboard with 7 different PC: 3 Lenovo laptop, 2 Medion, 1 Dell and 1 Asus, with windows 7 and windows 10 and even with windows XP on the first lenovo.
That was the MuseScore 2 world.
Now with MuseScore 3, entering  from the keyboard without shift key doesn't work anymore, and entering triplet just doesn't work at all:
neither CTRL+3 or CTRL+SHIFT+3 works.