Question
Is it possible to recover an organization or user if it was accidentally deleted?
Answer
No, it's not possible to recover a deleted organization or user. Zendesk is unable to recover the organization or user on your behalf in accordance with the Data Recovery Policy.
Closed tickets in the account retain a property called Ticket Organization, which stores the ID of the organization even after deletion. This can be used in Explore to review the data, or when reading the ticket through the API.