Magic Mouse only works with laptop open

I bought the Magic Mouse so I could wirelessly awaken my laptop while it was closed and connected to the television.
It worked for months. Now when I awaken the laptop with the mouse it turns on for one second and then turns off.
The mouse works perfectly fine with the laptop open and using the television as a "second monitor". It no longer works how I prefer it with the laptop closed (it's much better because then the sound comes through the TV and not the laptop speakers).
Why did this suddenly happen?

Hello Siôn Dafydd,
Welcome to the Apple Support Communities!
I understand that you are using an external display with your MacBook Pro and when you close the display on your MacBook Pro, the second display turns off. It sounds as though your MacBook Pro may not be connected to power while using with display closed. Please read over the attached article for information on using a second display in closed-clamshell mode.
How to use your Mac notebook computer in closed-clamshell (display closed) mode with an external display - Apple Support
Have a great day,
Joe

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