Inno Setup RegQueryStringValue is not reading values from HKEY_LOCAL_MACHINE

I created a setup to check the product name and the CurrentMajorVersionNumber of Windows Server 2019 Datacenter in Inno Setup.

But for any reason I can not get any logs in the Inno Setup file.

I checked the registry location for Server 2019 which is Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion.
The ProductName in the registry is REG_SZ.
The CurrentMajorVersionNumber in the registry is REG_DWORD.

function InitializeSetup(): Boolean;
var
  ProductName: string;
  CurrentMajorVersionNumber: string;  
begin
  if RegQueryStringValue(
       HKEY_LOCAL_MACHINE, '\SOFTWARE\Microsoft\Windows NT\CurrentVersion',
       'ProductName', ProductName) then
  begin        
    Log('  > ProductName:' + ProductName)
  end;

  if RegQueryStringValue(
       HKEY_LOCAL_MACHINE, '\SOFTWARE\Microsoft\Windows NT\CurrentVersion',
       'CurrentMajorVersionNumber', CurrentMajorVersionNumber) then
  begin        
    Log('  > CurrentMajorVersionNumber:' + CurrentMajorVersionNumber)
  end;
end;

When the above code is ran there is no log available. Reading other post on this platform regarding this topic could not help me. Is there any fix?