What does 'Active', 'Invited' and 'Removed' mean under Coworkers?
Under 'Settings' > 'My Organization' > 'Coworkers', you will see that state the coworker is in:
Active = User has their Tallyfy activated account
Invited = User has been sent an invite to join the organization, but not activated their account yet. You can resend an invite (If the invitee reports they did not receive the invite, please always check the email is correct and then also ask theperson to check their spam folder)