Exactly, you need to target an uninstall policy to this app to remove Managed Google play web link app. Generally speaking, if an app is unapproved or deleted from the managed Google Play store, it will not be removed from the Intune client apps list. This allows you to still target an uninstall policy to users even if the app is unapproved.
To turn off Android Enterprise enrollment and management, see Disconnect your Android Enterprise administrative account.
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