Your question appears to be related to the third party Uno platform and not related to C# or any MS product. Given the error message is Uno001
that seems to confirm this. Please post your question in their support forum.
C# - IsHdrMetadataFormatCurrentlySupported() throws Uno001: "Not Implemented in Uno"

Bryan Edwards
1
Reputation point
using Windows.Graphics.Display;
bool isHDR = DisplayInformation.GetForCurrentView().GetAdvancedColorInfo().IsHdrMetadataFormatCurrentlySupported(HdrMetadataFormat.Hdr10);
System.Diagnostics.Debug.WriteLine(isHDR);
Throws "Uno001: Not Implemented in Uno".
DisplayInformation.GetForCurrentView().GetAdvancedColorInfo() prints successfully, its just the IsHdrMetadataFormatCurrentlySupported() method that throws the error.
C#
C#
An object-oriented and type-safe programming language that has its roots in the C family of languages and includes support for component-oriented programming.
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