I wanted to share an issue that puzzled me for a while. I had issues with App Shortcuts not working. I tried different launchers, and I could not get long presses to give me the shortcuts, for example for Play Store or Settings.
It turns out that a launcher can only show app shortcuts if it's set as the default launcher (in Settings > Apps > Gear Icon > Home App).
So, if launcher long presses, aka. App shortcuts do not work for you, check your default launcher.