The start of the so-called Sunrise Period will be postponed by two months. The original schedule called for January 1, 2023, as the start of the Sunrise Period and for the EPC to enter into force on April 1, 2023. The additional time is intended to allow future users to prepare for the authentication that will be required to access the case management system (CMS) and sign documents.

https://www.unified-patent-court.org/en/news/adjustment-timeline-start-sunrise-period-1-march-2023