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A call to IsDxgiFormatSupported was made with DXGI_FORMAT_UNKNOWN. This API returns false, though DXGI_FORMAT_UNKNOWN may be valid as an input to some APIs.
Possible Causes
A call to IsDxgiFormatSupported was made with DXGI_FORMAT_UNKNOWN.
Possible Fixes
Determine whether DXGI_FORMAT_UNKNOWN is a valid buffer precision for a given API by reading the documentation for that API rather than trying to determine this programmatically.