Syntax error in sudoers file

I wanted to allow my ordinary user to run /usr/bin/brightnessctl to turn on/off the keyboard backlight on my laptop, so I did

visudo -f /etc/sudoers.d/grove

(grove is my username, but all that matters here is that that file is included in /etc/sudoers) That file already contained these lines:

grove   ALL=(ALL) NOPASSWD: /usr/bin/light -A 5
grove   ALL=(ALL) NOPASSWD: /usr/bin/light -U 5

so I just mimicked those and tried adding

grove   ALL=(ALL) NOPASSWD: /usr/bin/brightnessctl -d tpacpi::kbd_backlight s 2
grove   ALL=(ALL) NOPASSWD: /usr/bin/brightnessctl -d tpacpi::kbd_backlight s 0

but that make visudo report a syntax error:

/etc/sudoers.d/grove:3:59: syntaksfejl
grove   ALL=(ALL) NOPASSWD: /usr/bin/brightnessctl -d tpacpi::kbd_backlight s 2
                                                          ^~
/etc/sudoers.d/grove:4:59: syntaksfejl
grove   ALL=(ALL) NOPASSWD: /usr/bin/brightnessctl -d tpacpi::kbd_backlight s 0
                                                          ^~

(syntaksfejl is Danish for syntax error, I have LANG set so everything speaks Danish, and I see no reason to redo it with LANG=C to provide an error in english for such little text) What is wrong here? Is it the colons (and the indicator being wrong, which might be caused by a TAB after grove), and if so how can I allow that command? Should I just allow /usr/bin/brightnessctl and accept that I can control more things? (If it matters, I'm working on a Debian 12)