Paid for pro but only have one license

[LivingWell]

Hello, 

My organisation has the Pro version of Zoom. The website says that this allows us to have up to nine licenses. However, we only have one user, and when I try to add another user, it says there are no more licenses available and that I need to buy more. Then when I clicked on "purchase more licenses" it took me to a page to upgrade my account. I don't understand why I need to upgrade my account, if 9 licenses are included in pro. 

Can anyone help?

Many thanks