In the Boruto manga, Boruto got a curse mark for killing/defeating an Otsutsuki clan member (Momoshiki). Why did Naruto not get a Mark for killing/defeating Toneri?
The reason is that Toneri is not dead.
He just went into self imposed exile, and he also makes an appearance in Boruto anime series. When he sees a comet passing into a constellation, he predicts that Boruto will play a key role in the fateful events to come.