Why doesn't this datastore work?

The script is supposed to keep the players health inbetween two places (but are still in the same "universe")!

here is the script

local healthStore = game:GetService("DataStoreService"):GetDataStore("healthStore")
game.Players.PlayerRemoving:connect(function(player)
player:UpdateAsync(player.Name.." saved health", player.Character.Humanoid.Health)
end)

and

local healthStore = game:GetService("DataStoreService"):GetDataStore("healthStore")

game.Players.PlayerAdded:connect(function(player)
player.Character.Humanoid.Health = healthStore:GetAsync(player.Name.." saved health") --sets the Humanoid's health to the saved number, which is the health when the player left the previous Place
end)

this is not my script, I got it from somebody else that helped me!

First Universe:

local healthStore = game:GetService("DataStoreService"):GetDataStore("healthStore")
game.Players.PlayerRemoving:connect(function(player)
player:SetAsync(tostring(player.userId).." saved health", player.Character.Humanoid.Health)
end)

Second Universe:

local healthStore = game:GetService("DataStoreService"):GetDataStore("healthStore")
game.Players.PlayerAdded:connect(function(player)
player.CharacterAdded:connect(function(c)
c.Humanoid.Health = healthStore:GetAsync(tostring(player.userId).." saved health")
end)
end)