Invincibility item not working as planned...

Im trying to make an item that, when held, renders the wielder invincible. I thought it would be as simple as using the ticks when item is in hand trigger to give the player potion effects resistance and regeneration without particles at level 999 for 60 ticks. When the item is held in my hand however it does nothing, is the problem that its not repeating the function every tick? I'm new to mcreate so surely there's a proper way to implement this item.