Folders returning null

I'm trying to use the code from this article: https://pnp.github.io/pnpcore/using-the-sdk/files-intro.html#enumerating-files to get a list of files from a document library:

`// Get root folder of a library
IFolder folder = await context.Web.Folders.FirstOrDefaultAsync(f => f.Name == "Documents");

// Load files property of the folder
await folder.LoadAsync(f => f.Files);
foreach (var file in folder.Files.AsRequested())
{
// Do something with the file
Debug.WriteLine(file.Name);
}`

However I see that folder is returning null. I'm using interactive login. Not sure what I'm doing wrong.

Start with the linked Files introduction article and reproduce the interactive-login example against a document library. Trace the folder lookup and inspect why it returns null; the issue is done when the root folder resolves and its files can be enumerated as shown.