Morning @Chris_Hofer Thanks for your help.
On the "Section Enrolments" pop up window when I click browse it says, 'no results found'. Even though if I go to the course "Settings > Sections" I can see the two sections I've created.
If I manually add people onto the course, I have the Section dropdown and I have the option of selecting either of the sections from there. I've added two test students on to the course, each under a different Section and that works fine. Changing the "Section" from "People" page seems to be where I'm having issue.
Also, it doesn't seem to matter if the student is pending or has accepted the course, I still don't see any more section options.
I tried out your suggestion adding in start/finish dates and checking the participate between dates check box but unfortunately this didn't help thing along. Any other ideas I could try?
Thanks