The Nuzlocke challenge doesnt work

So i tried the Nuzlocke thing aaaand somehow when i clicked it and played but then i realized that when im playing it that the challege feature isnt on. What should i do and is it normal?

You might want to check again. The game doesn’t tell you if you turned on Nuzlocke Mode unless your entire team dies. Your Pokémon can also not be revived when you’re in this mode, so you can test it out by catching a random Pokémon and killing it, then go to the Pokémon Center, heal and see if it’s still dead. If all of this doesn’t work, maybe re-download the game and then reset your save file?