@Richa Kumari , For the Android device, are they enrolled with Android device administrator?
In General, for Android Device Admin devices, a shortcut to the web app is added to the Intune company portal widget and the widget needs to be pinned manually by the user. You can see more details in the following link:
https://learn.microsoft.com/en-us/mem/intune/apps/web-app
Hope it can help.
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