https://www.siliconvalley.com/2024/01/12/disneylands-magic-key-passes-sell-out-after-one-day/

Disneyland’s Magic Key passes resumed sale on Wed. Jan. 10.

Magic Key passes are Disneyland’s annual pass system that went into place in 2021. Different from their previous system, guests are now required to make a reservation to enter the park regardless of their ticket or pass type. Disneyland implemented the new system as part of their COVID-era protocols to better regulate how many guests were attending the Anaheim theme park.