Hi there! I understand that your Oticon Companion app has disappeared from your device. Let's get to the bottom of this together.

To start, can you tell me a bit more about what happened? Did the app suddenly vanish from your Android device, or did you uninstall it by any chance? Also, are you able to find the app icon when you search for it on your phone? This info will help me give you the right advice.

Meanwhile, here are some initial steps you can try:

1. Search Your Phone: Swipe up on your home screen to open the app drawer and type "Oticon Companion" in the search bar to see if it's still installed but hidden or moved.

2. Check the Play Store: Open Google Play Store, search for “Oticon Companion,” and see if the app shows up as installed or if you can install it again.

3. Restart Your Phone: Sometimes a simple reboot can refresh app listings and fix temporary glitches.

If the app is not found in the Play Store or you cannot reinstall it, please let me know. We might have to verify if there have been any changes affecting the app availability for Android 10 devices like yours.

How does this sound? Let me know what you find after these steps, and we’ll continue from there.