This is usually for one of two reasons:
The contact is not in the right sector.
The contact is already at the client but has been marked as Has left.
To view existing contact on a client who has left:
Click Clients and then click the Contacts tab.
Click the Eye icon (
) to view the contacts.This will list all the contacts including those who have left, to remove the Has Left flag:
Select the contact.
Click the Details tab.
Click within the Has Left tick box to enable editing.
Click within the Has Left Tick box to remove the tick.
Click the tick icon below the Has Left box to save the changes.