https://www.bleepingcomputer.com/news/microsoft/microsoft-launcher-beta-for-android-updated-with-new-features-and-animation/

Microsoft Launcher Beta for Android is getting a big update today with new features, animations, and other major improvements. If you’ve enrolled as a beta tester you can download the v4.12 update from today via the Play Store.

Microsoft Launcher is no longer available for Android 4.0.x and 4.1 devices, which means that only newer versions of Android are able to install it.