How can i save the player's team with a datastore? [2]

local datastore = game:GetService("DataStoreService"):GetDataStore("GameStore")

game.Players.PlayerAdded:connect(function(player)
	
	local team_name = player.Team.Name

	local team = game.Teams:FindFirstChild(team_name)
		
	local key = "user-" .. player.userId
	
	local storeditems = datastore:GetAsync(key)
	if storeditems then
		team = storeditems[1]
		print("loaded!")
		print(team.Name)
		print(key)
	else
		local items = {team}
		datastore:SetAsync(key, items)
		error("not loaded!")
	end
end)

game.Players.PlayerRemoving:connect(function(player)
	local items = {player.Team}
	local key = "user-" .. player.userId
	datastore:SetAsync(key, items)
	print("saved! (plr removed)")
end)

ERROR MESSAGE: Cannot store Array in data store. Data stores can only accept valid UTF-8 characters. (At the bottom part) Please fix this, i don't know how to get the player's team (aka team (line 5-7))

This is how I would do it.

ModuleScript in ServerScriptService and I named it "TeamModule" -

local teamModule = {}

local DataStore2 = require(1936396537)

DataStore2.Combine("MainKey","Team") -- You Can Change MainKey To Any New Value To Reset The DataBase

local defaultTeam = "None"

function teamModule:SetPlayerTeam(player)
	if player:IsA("Player") then
		local excessData = Instance.new("Folder",player)
		excessData.Name = "ExcessData"
		
		local teamValue = Instance.new("StringValue",excessData)
		teamValue.Name = "Team"
		
		local teamStore = DataStore2("Team",player)
		
		local function updateTeam(team)
			player.ExcessData.Team.Value = team
		end
		
		updateTeam(teamStore:Get(defaultTeam))
		
		teamStore:OnUpdate(updateTeam)
	else
		error("The First Parameter Has To Be A Player")
	end
end

return teamModule

This is a ServerScript in ServerScriptService and I named it TeamSet -

local teamModule = require(script.Parent.TeamModule)

local DataStore2 = require(1936396537)

local RE = game:GetService("ReplicatedStorage"):WaitForChild("Events")

game.Players.PlayerAdded:Connect(function(player)
	teamModule:SetPlayerTeam(player)
	wait(1)
	local team = game:GetService("Teams"):FindFirstChild(player.ExcessData.Team.Value).TeamColor
	wait()
	player.TeamColor = team
	wait(0.25)
	player:LoadCharacter()
end)

RE.TeamChange.OnServerEvent:Connect(function(player,team)
	player.TeamColor = game:GetService("Teams"):FindFirstChild(team).TeamColor
	player.ExcessData.Team.Value = team
	local teamStore = DataStore2("Team",player)
	teamStore:Set(team)
	wait(0.1)
	player:LoadCharacter()
end)

And Then I have a folder in ReplicatedStorage called Events, and you should keep all RemoteEvents and Functions in there, and it will save their team. All you have to do is have the first team enabled Auto-Assignable, and the other teams should not have that enabled. It will get their team, and then respawn them on their team at that spawn. It should work, if it doesn't, let me know so I can tweak it and fix it for you. And for it to work in studio if you want to test it, you have to put a BoolValue inside of ServerStorage and name it SaveInStudio and have it enabled to true for it to work in studio.