Bug With Sharing Button in OneDrive Web Application
Although this used to be possible until a recent update with affecting the sharing button.... you can no longer share files/folders with people.
You can start typing to select individuals from the company directory, however you cannot actually select any of them. Clicking on them does not work, nor does typing the users full name.
I have tested this on Mac OS X in Safari and FireFox and the results are the same.