Advancements not working

Everything of my datapack seems to be fine like load.mcfunction is running and so on, but the advancements are not working
here my advancement
{
    "criteria": {
        "requirement": {
            "trigger": "minecraft:entity_hurt_player"
        }
    },
    "rewards": {
        "function": "custom:firegem/passive_b"
    }
}

It should run this mcfunction
advancement revoke @s only custom:firegemhit
# Just for testing
say hi

but it is not running the function, file path also seem to be okay.
Please Help me!