After entering the channel number then pressing Watch on the keypad, I can see the channel numbers appearing but after a few seconds they disappear from the screen without changing the channel. It appears that the Watch key doesn't include an Enter command after the channel number--which seems like a missing feature or option. I Chatted with support on-line that suggested after pressing the Watch key to then use the D pad's select key to include the enter command. This does work, but this seems like a silly work around.
Please consider adding an option to send an Enter command with the Watch key on the keypad.