California Code, Business and Professions Code - BPC § 5070.5

(b) A permit to practice as an accountancy partnership or an accountancy corporation expires at 12 midnight on the last day of the month in which the permit was initially issued during the second year of a two-year term if not renewed.  To renew an unexpired permit, the permitholder shall, before the time at which the permit would otherwise expire, apply for renewal on a form prescribed by the board, pay the renewal fee prescribed by this chapter, and provide evidence satisfactory to the board that the accountancy partnership or accountancy corporation is in compliance with this chapter.

(c) On or before July 1, 2020, each permitholder who has a valid email address shall provide that email address to the board.

(d) A permitholder shall notify the board within 30 days of any change to their email address on file with the board.  The board may periodically, as it determines necessary, require permitholders to confirm that their email address on file with the board is current.