Create Ticket ignores a list of "secondaryContacts"

Create Ticket ignores a list of "secondaryContacts"

Hi, we're trying to create a ticket, with a contact to be a CC. According to the documentation, it should be a list of IDs in "secondaryContacts". But when the ticket is created, it returns an empty array.

Has someone tried it? Thanks for any hint. BTW the contact is in the same account as the main contactId. And we're also sending departmentId, assigneeID and subject, plus a description. The secondaryContacts is ignored, though, when we tried something else than a list of IDs (objects with emails and names), it returned an error.

Thanks!