Here's the query that is failing: https://graph.microsoft.com/beta/me/files (It's also present in the Microsoft website here: https://msdn.microsoft.com/en-us/office/office365/howto/office-365-unified-api-overview?f=255&MSPPError=-2147217396)
The error message I am getting is:
Resource not found for the segment 'files'.
Thanks
We made an update to the API to align with the converged OneDrive API that works for both consumer and commercial users. More details here: http://dev.office.com/blogs/Update-2-on-Office-365-unified-API