Long paths not working in MS Windows 2019 even after enabling in registry

Question

Followed the steps given below to enable long paths and rebooted the machine

• Press Win + R keys on your keyboard and type regedit then press Enter.
  Registry Editor will be opened.

• Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\FileSystem

• Edit LongPathsEnabled and set it to 1.

• Press Win + R keys on your keyboard and type gpedit.msc then press Enter.
  Group Policy Editor will be opened.

• Go to Local Computer Policy -> Computer Configuration -> Administrative Templates -> System -> Filesystem, then enable the Enable Win32 long paths option.

• Restart machine.

Executed the below program to check if the file gets created in the already existing folder structure C:\abcdefghijklmnopqrstuvwxyz\abcdefghijklmnopqrstuvwxyz\abcdefghijklmnopqrstuvwxyz\abcdefghijklmnopqrstuvwxyz\abcdefghijklmnopqrstuvwxyz\abcdefghijklmnopqrstuvwxyz\abcdefghijklmnopqrstuvwxyz\abcdefghijklmnopqrstuvwxyz\abcdefghijklmnopqrstuvwxyz

int main()
{
    HANDLE h = CreateFileA(
    "C:\\abcdefghijklmnopqrstuvwxyz\\abcdefghijklmnopqrstuvwxyz\\abcdefghijklmnopqrstuvwxyz\\abcdefghijklmnopqrstuvwxyz\\abcdefghijklmnopqrstuvwxyz\\abcdefghijklmnopqrstuvwxyz\\abcdefghijklmnopqrstuvwxyz\\abcdefghijklmnopqrstuvwxyz\\abcdefghijklmnopqrstuvwxyz\\012345678901234567890123456789.txt",
    GENERIC_READ | GENERIC_WRITE,
    0,
    NULL,
    CREATE_NEW,
    FILE_ATTRIBUTE_TEMPORARY,
    NULL);
    
    if (h == INVALID_HANDLE_VALUE) { DWORD err = GetLastError(); printf("err %dn", err); getchar(); return 1; }
    printf("Created\n");
    getchar();
    
    return 0;
}

The above program failed to create the file and produced the following output

err 3

The same program worked in MS Windows 2016

What additional thing needs to be done in Windows 2019 for long paths to work?

Machine details:
Windows Server 2019
Microsoft Windows Server
Version 1809 (OS build 17763.316)