When an employee works for more than one company that has Hub, they have to either maintain two email addresses or two passwords. If they use the same email for both companies, they cannot change their password.
I would love to see one Hub account per employee (or the ability to merge them if requested so two aren't accidentally merged if info is keyed wrong or employees share email addresses). When the employee logs into their Hub, have a dropdown for them to choose the company they would like to go into. If one is active, have it show in yellow or have inactive next to that company's name.