Body Velocity Issues and I don't know what to do anymore... Help?

Alright so, I was testing these animations for a while and when the dummy gets kicked it doesn't move at all. When I was using a "StarterCharacter" The same thing happened in which the body velocity does not move the character at all. Basically, I need the Dummy model to get kicked backwards but instead it's staying the same place, I don't really know what to do here.

Here

StarterCharacter

What It's Supposed To Look Like

--Script

game.ReplicatedStorage.Kick.OnServerEvent:Connect(function()
	
	local bv = Instance.new('BodyVelocity')
	bv.Parent = workspace.Dummy.HumanoidRootPart
	bv.Velocity = workspace.Dummy.HumanoidRootPart.CFrame.LookVector * 500
	bv.MaxForce = Vector3.new(9999 , 9999 , 9999)
		
	wait(.85)
	bv:Destroy()
	
end)

--When Event Is Fired

TU.KeyframeReached:Connect(function(key)
	
	if key == "Kick" then
		CH:Stop(.3)
		KI:Play(.3)
		KI:AdjustSpeed(1.15)
		
		game.ReplicatedStorage.Kick:FireServer()

		
		local bv = Instance.new('BodyVelocity')
		bv.Parent = player.Character.HumanoidRootPart
		bv.Velocity = player.Character.HumanoidRootPart.CFrame.LookVector * 5
		bv.MaxForce = Vector3.new(9999 , 9999 , 9999)
		
		wait(.85)
		bv:Destroy()
		
		
		wait(2)
		
		player.Character.Humanoid.WalkSpeed = 16
		player.Character.Humanoid.JumpPower = 50
		
	end
	
end)

The script above works when I don't have a Custom Character but when I do the model doesn't move.

In the gif, the dummy doesn't move at all and in this code in which I tested on my default player not a "StarterCharacter" the script worked like a charm but when I added a "StarterCharacter" I didn't move. Any kind of help would be greatly appreciated or advice on what to do.