I emailed UCLA Admissions at the end of February asking about when the Regents invites came out, and their reply was something along the lines of: “Invitations for the Regents Scholarship have already been sent out for Fall 2021 transfers. Unfortunately, you were not invited to apply for this scholarship”.
In addition, a few folks have reported receiving Regents invites last month. Here’s an example:
http://talk.qa.collegeconfidential.com/t/ucla-regents-scholarship-invitation/3501691