The profile of the employee might be deactivated which is why it's not visible on the directory page.
To verify that, please select the tab "show all employees"
You can then find the deactivated profile of the employee that are part of your TimeDive workspace.
To activate the profile, please click on the user and select "Activate"
Note:
If you are still unable to find them, please reach out to us by raising a ticket and we'll look up for you.