I get the error attempt to concatenate field 'Team' (a userdata value). What am I doing wrong?

I am working on a game where I have a custom playerlist with team support. However, I get this error that I don't understand. I do know it is an error when you forget to mention the ".Value" in a variable object. But this? Hmm...

Error:

17:24:16.069 - Players.iBoai.PlayerGui.CustomPlayerlist.MainFrame.PlayerListManager:12: attempt to concatenate field 'Team' (a userdata value)

Code:

wait(2)
local teams = game:GetService("Teams")
local teamLobby = teams:WaitForChild("Lobby")
local teamKiller = teams:WaitForChild("Killer")
local teamTestSubjects = teams:WaitForChild("Test Subjects")
local labelModel = script.Parent.Model
local lastSize = script.Parent.LastSize

while script.Parent.Visible == true and wait(0.1) do
    for i,v in pairs(game.Players:GetChildren()) do
        local newLabel = labelModel:Clone()
        newLabel.Text = "["..v.Team.."] "..v.Name
        newLabel.Position = UDim2.new(1, 1, 0, lastSize.Value)
        newLabel.Visible = true
        lastSize.Value = lastSize.Value + 50
    end
end

What the heck am I doing wrong? Hmm...