I can't create a camera in my ViewportFrame, why?

When I try to create a camera with my function :GetViewportFrame(), the camera disappears! No error is recorded, I dont understand why the camera "destroys" itself and how to fix it? Because I do not see any error in my function. Instance.new (type, parent) is supposed to work so I dont understand where the error is.

Explorer here

Script

function InstanceGame:VoteTime()
	for i = 1, 3 do -- Set three maps.
		local SurfaceGui = Instance.new('SurfaceGui', MapVoter.System.Screens[i].Screen)
		SurfaceGui.CanvasSize = Vector2.new(260, 400)
		SurfaceGui.Face = 'Right'
		
		local ViewportFrame = InstanceGame:GetViewportFrame(Map)
		ViewportFrame.Parent = SurfaceGui
	end
end

function InstanceGame:GetViewportFrame(Receive)
	local ViewportFrame = Instance.new('ViewportFrame')
	ViewportFrame.Size = UDim2.new(1, 0, 1, 0)
	
	local Map = Receive:Clone()
	Map.Parent = ViewportFrame
	
	local Camera = Instance.new('Camera', ViewportFrame)
	ViewportFrame.CurrentCamera = Camera
	Camera.CFrame = Map.Cinematic.PartA.CFrame
	
	return ViewportFrame
end