Intune Managed Browser allows organizations to ensure that its employees access corporate websites with safeguards in place. Intune Managed Browser will take advantage of application protection policies, conditional access, single sign-on and more.
The new Microsoft Edge browser supports all of the same management scenarios as the Intune Managed Browser with the addition of new features to end-user experience. So, Microsoft has now decided to kill Intune Managed Browser for iOS and Android devices. Starting on January, 27, 2020, Intune will no longer support the Intune Managed Browser. And from February 1, 2020, the Intune Managed Browser will not be available in the Google Play Store or the iOS App Store. From March, 31 2020, the Intune Managed Browser will be removed from the Azure console as well.
You can learn more about this change from the source link below.