Last channel shortcut?

Does anyone have this working with a single button press with a Harmony Hub? I am using Keyboard shortcut "P" for Picture in Picture but I can't seem to get Last/Previous Channel working in the same manor. I tried MCE Keyboard, and the "backspace" button, but I couldn't get any MCE Keyboard buttons to work with the Apple TV 4K, only Windows Keyboard works, but it doesn't have the "backspace" option.

For sure on android tv and pretty sure on Apple TV two quick presses of the play button will go to last channel. You could easily create a custom string of presses in harmony and assign that to a key on the remote.

That worked great.

This does not work on the ONN 4k box, Android TV version.
There is no "Play" button on the remote.
Pressing the OK button quickly also does not work.

Shouldn't matter as long as you use a Harmony Hub. Just use the play or pause keystroke on the Windows Computer device.