https://admission.universityofcalifornia.edu/admission-requirements/freshman-requirements/exam-requirement/
University of California:
Fall 2021 enrollment
UC will not consider SAT or ACT test scores when making admissions decisions or awarding Regents and Chancellor’s scholarships. If you choose to submit test scores as part of your application, they may be used to determine your eligibility for the California statewide admissions guarantee, as an alternative method of fulfilling minimum requirements for eligibility or for course placement after you enroll.
However, it does not say anything about when official test score reports are needed if you want to send them for those other purposes besides admission and those specific scholarships.