Sec. 29. (a) A public officer or office entitled to receive notice may designate in writing filed with the commission alternate or additional persons to whom notice required to be served upon the officer or office shall also be served. The commission shall maintain a complete list of the persons and their addresses.
(b) A person, an official, or an office who or that is not served notice in the manner prescribed by this chapter is not considered properly notified unless the person has waived notice in writing.