Pressing Enter will not work with Custom Chat GUI. How could I fix?

So I have a Custom Chat GUI. What isn't working here is when I press enter after typing a message, it doesn't do anything. I've added a function and an if statement to detect if the Enter key was pressed. I've also added something so inside the if statement, it would execute a print command at the beginning and one after it to see if it was working, but nothing shows up in output.

local Player = game.Players.LocalPlayer
local Parent = script.Parent
local Mouse = Player:GetMouse()
local msgbar = Parent.msgbar

function EnterTriggerSend(inputObject, gameProcessedEvent)
	if inputObject.KeyCode == Enum.KeyCode.Return and script.Parent.msgbar:IsFocused() then
		wait()
		print "Pre-Test Successful"
		script.Parent.Parent.MsgChatFrame.chatbox6.Text = script.Parent.Parent.MsgChatFrame.chatbox5.Text
		script.Parent.Parent.MsgChatFrame.chatbox5.Text = script.Parent.Parent.MsgChatFrame.chatbox4.Text
		script.Parent.Parent.MsgChatFrame.chatbox4.Text = script.Parent.Parent.MsgChatFrame.chatbox3.Text
		script.Parent.Parent.MsgChatFrame.chatbox3.Text = script.Parent.Parent.MsgChatFrame.chatbox2.Text
		script.Parent.Parent.MsgChatFrame.chatbox2.Text = script.Parent.Parent.MsgChatFrame.chatbox1.Text
		script.Parent.Parent.MsgChatFrame.chatbox6.Text = script.Parent.msgbar.Text
		wait(0.1)
		script.Parent.msgbar:ReleaseFocus()
		script.Parent.msgbar.Text = "Tap the "/" button or click here to chat"
		print "Post-Test Successful"
		wait()
	end
end

game:GetService("UserInputService").InputBegan:connect(EnterTriggerSend)

Chat GUI

Hierarchy of GUI

You should escape your quotes

script.Parent.msgbar.Text = "Tap the \"/\" button or click here to chat"

	local boxes = script.Parent.Parent.MsgChatFrame

	script.Parent.msgbar.FocusLost:Connect(function(enter)
	    if enter then --Did the player press enter to stop focus? We don't want people to send messages by clicking on another text box!
	        print "Pre-Test Successful"
	            for box = 6, 2, -1 do
	            boxes['chatbox'..box].Text = boxes['chatbox'..(box - 1)].Text
	        end
	 
	              script.Parent.Parent.MsgChatFrame.chatbox6.Text = script.Parent.msgbar.Text
	        --We don't want the player to think their game is lagging, so I removed the wait.
	            script.Parent.msgbar.Text = "Tap the \"/\" button or click here to chat"
	            print "Post-Test Successful"
	    end
	end)

I also shortened the code a little.