@Roy Chung , From your description, it seems the windows 10 1809 are failed to apply the profile. But the Windows 10 21H2 can apply successfully.
Firstly, I would like to confirm if the profile is configured as below:
OMA-URI: ./Device/Vendor/MSFT/Policy/Config/InternetExplorer/DisableInternetExplorerApp
Data type: String
Value:
<enabled/><data id="NotifyDisableIEOptions" value="2"/>
Meanwhile, for the windows 10 1809, I notice it needs to upgrade to "Windows 10 version 1809, Windows Server version 1809, and Windows Server 2019: KB4598296 or later". Please install the latest KB for windows 10 1809 to see if it can be applied successfully.
https://support.microsoft.com/en-us/topic/january-21-2021-kb4598296-os-build-17763-1728-preview-4c0931ff-45b7-ff59-5e00-c03b5afb363d
Please try the above suggestion and if there's any update, feel free to let us know.
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