Follow these steps as a hub administrator to invite members of your organization to a hub so they can access Fusion and collaborate on designs.
In Fusion, at the top left of the window, verify you're working in the correct hub.

Click Invite Members.
Enter the email addresses of people you want to invite.
Click Invite to send the invitations.
Optional: To set project roles for invited members, see Change or remove the role of a project member.
You can now assign Fusion licenses to the members you invited.
For more information on setting up Fusion hubs, read this Autodesk blog post.