Why aren't my app icons showing up after installed?

Question

I have Moto X Style phone having Android 6.0.

Today I installed "Stereo Bluetooth Headset SBH52" app on my phone, but I am not able to open this app because there is no app launcher icon in the launcher. In Play Store, it's also showing Uninstall button only. I am able to see the app in Setting > Apps. Here, only Uninstall button is enabled.

I have one more app "Exchange Server" which is there in Apps list, but the icon is not available in the launcher.

I also have restarted the phone. I removed the SD card, then again installed these app from Play Store, but still the issue is there.

Why are there no app icons showing up?

Answer 1

Not all apps have explicit launchers (or app icon).

Take an example from Stereo Bluetooth Headset SBH52 app:

This application will not be visible in your phone's home screen. Access application settings via Smart Connect (LiveWare™ Manager), or via your phone's status bar.

^{(Emphasis added)}

As for Exchange Server (or Exchange Services on Nexus stock ROM), it's only a back-end service used for communicating with Exchange server, with stock E-Mail app as its front-end UI.

Another example is Google PDF Viewer, where it's only prompted when opening a PDF file. (see How to open Google PDF Viewer app?).

If you want to force open the app, you might be interested in List all activities of an app.