No problem. This happens if the organization was created before the new External Contacts feature was released.
To use the feature, add the following permissions to whichever role should have access to it:
externalContacts:contact:*
and
externalContacts:externalOrganization:*
(For new orgs, these are automatically included as part of the employee role.)
In addition, if the customer wants to import contacts in bulk from a csv file, then the person who will do that should be assigned the externalContacts:externalEntity:import permission.
(For new orgs, that permission is automatically assigned to the admin role.)
For more information about doing a bulk import, see https://help.mypurecloud.com/articles/perform-bulk-import-external-contacts-organizations/