Sublime 3 toggle comment command doesn't work in Windows

I solved my problem:

[
    { "keys": ["ctrl+keypad_divide"], "command": "toggle_comment", "args": { "block": false } },
    { "keys": ["ctrl+shift+keypad_divide"], "command": "toggle_comment", "args": { "block": true } },   
]

Just replace '/' by 'keypad_divide'

This works for me, with a QWERTY (Italian) keyboard, where the / is above the number 7.

Add in Preferences > Key Bindings User

{ "keys": ["ctrl+7"], "command": "toggle_comment", "args": { "block": false } },
{ "keys": ["ctrl+shift+7"], "command": "toggle_comment", "args": { "block": true } }

It should works good on German QWERTZ keyboard also.

This worked for me on Windows 10:

{ "keys": ["control+keypad_divide"],"command": "toggle_comment", "args": {"block": false} }, 
{ "keys": ["shift+control+keypad_divide"],"command": "toggle_comment", "args": {"block": true}}