The keyboard shortcut for N tilde or "enye" is ALT+165 for "
Ñ" and ALT+164 for "
ñ" but there are instances that this wont work for some reasons. Is it the keyboard causing the problem or i heard some update related issues. But if those keyboard shortcuts wont work on you, use this shortcuts keys instead ALT+0209 for "
Ñ" and ALT+0241 for "
ñ".