How would I detect a change in "TeamColor"?

So I'm currently am working on a Rank system that runs off a Level system, and I have that already made, but I'm trying to make it where when a player joins another team the Rank changes to that team's equivalent of the rank. I tried using GetPropertChangedSignal but had no luck, and I got an error. (The resulting error will be given soon.) I understand the error but I just don't know any other way to detect a change.

GetPropertChangedSignal is not a valid member of Player "Players.vincentthecat1"(Does not appear anymore, but the code still does not work.)

--//USRankTeamChange\\--
game.Players.PlayerAdded:Connect(function(player)
	player:GetPropertyChangedSignal("TeamColor"):Connect(function() ---Wont Work.
		player:WaitForChild("leaderstats").Rank.Value = USRankHandler.Rank(player:WaitForChild("leaderstats2").Level.Value)
	end)
end)

Is something like this simply not possible, or is it, and I am just using the GetPropertyChangedSignal wrong?