IPA: /ʌnˈɪʃuːd/
KK: /ʌnˈɪʃʊd/
Describing something that has not been distributed or released to the public.
The unissued tickets were kept in a safe until the event date.
Unissued → It is formed from "un-" (meaning not) and "issued" (from Latin "issere", meaning to send out). The word "unissued" means not sent out or not distributed.
Think of 'not' ('un-') having something 'sent out' ('issued') — that's why unissued means something that hasn't been sent out.