Beginning May 23, 2022, Outlook for Android will no longer support Android 7.1 or below. Users will need to upgrade their Android operating system to Android 8.0
If you are using Outlook for Android on a phone running an older version of Android, you will no longer be able to update to newer versions of Outlook for Android when this change is implemented.
Please ensure you update your operating system to Android 8.0 or newer.