The start of the Sunrise Period is postponed for two months. The initial roadmap foresaw 1 January 2023 as the beginning of the Sunrise Period with an entry into force of the new system on 1 April 2023 (now 1 June 2023). The additional time is intended to allow future users to prepare themselves for the “strong authentication” which will be required to access the Case Management System (CMS) and to sign documents. The CMS and the required strong authentication system still are not functional and leave many questions open.
For further information see: Adjustment of the timeline – Start of the Sunrise Period on 1 March 2023 | Unified Patent Court (unified-patent-court.org)