I am an admin and it appears to work for me, but this is a screenshot from a non-admin user trying to enrol other users.
The buttons become inactive for them.
1. They are logged in while trying to purchase seats
2. I have checked that purchasing seats has been enabled for both levels of Primary Catalogue and Sub Catalog.
3. There is a seat limit but there is plenty available.
I'm not sure what I am missing and would appreciate any help!
Thank you.