Why is my pathfinding zombie not going to any players?

Hi, all. I have a script in a Humanoid that is supposed to find a random player and use Roblox's pathfinding service to maneuver its way around walls to get to the player.

But the Humanoid doesn't go anywhere, and there are no errors in the output.

Here's the script inside the Humanoid:

local root = script.Parent.Parent.HumanoidRootPart -- Get the zombie's HumanoidRootPart

function moveToPlayer() -- Declare the function
	local players = game.Players:GetPlayers() -- Get a list of players
	for _, each in ipairs(game.Players:GetPlayers()) do -- Find a random player
		local char = each:FindFirstChild("Character") -- Get player's character...
		if char then -- ...and check if it exists
			local human = char.Humanoid -- Get the char's humanoid
			if human.Health > 0 then -- Check if the humanoid still alive
				local pRoot = human.Parent.HumanoidRootPart -- Get the character's HumanoidRootPart
				local path = game:GetService("PathfindingService"):ComputeRawPathAsync(root.Position, pRoot.Position, 500) -- Compute a path
				local points = path:GetCoordinates() -- Get a list of the coordinates
				for i = 1, #points do
					script.Parent:MoveTo(points[i]) -- Make the zombie move along the points
				end
			end
		end
	end
end

while wait() do
	moveToPlayer()
end

Please help me. I'll give you a free, imaginary, figurative, nonexistent cookie if you do!

There are two problems with the code you have written. The first is that you are running the follow code for every player, rather than choosing a random player. The second is that Humanoid:MoveTo doesn't yield, so in a loop with no waits the zombie will almost instantly start heading to the final point in the list. Below is an example of your code where these problems are corrected.

local root = script.Parent.HumanoidRootPart
local rand = Random.new()

local function Path()
	local players = game.Players:GetPlayers()
	if #players > 0 then
		-- From the list of all players, choose a random player
		local playerToFollow = players[rand:NextInteger(1, #players)]
		if playerToFollow.Character and playerToFollow.Character.Humanoid.Health > 0 then
			local pRoot = playerToFollow.Character.HumanoidRootPart
			local path = game:GetService("PathfindingService"):ComputeRawPathAsync(root.Position, pRoot.Position, 500)
			local points = path:GetPointCoordinates()
			
			for i = 1, #points do
			    script.Parent.Humanoid:MoveTo(points[i])
			
				repeat -- Wait until we are close to a point before moving to the next
					local distance = (points[i] - root.Position).magnitude
					wait()
				until distance < 3
			end
		end
	end
end

-- The number inside wait will determine how long the zombie idles at
-- the end of a path before starting to follow another player
while wait(1) do
	Path()
end