To use BeehiveOnline you have to be a member of the group you want to work with - there is no access without having membership of a group - even if you are an Oracle employee. Making the workspace "Public" only opens it up to logged in users who have the URL and, by the way, is not recommended as it can compromise the security of the space.
The 2 users need to be added to the system and put in a group you are also a member of before you can see them - this is a workspace unassociated with a group so I don't know which group you need to add them to.
This is a purely internal workspace with internal users only. Tier one support redirected to post the problem here.
Noting that there is a difference internally, how do you associate a workspace to a group for Online?