Ariz. Rev. Stat. § 29-3119 – Service of process, notice or demand

A. A limited liability company or registered foreign limited liability company may be served with any process, notice or demand required or permitted by law by serving its statutory agent.
B. If a limited liability company or registered foreign limited liability company ceases to have a statutory agent, or if its statutory agent cannot with reasonable diligence be served, the company or foreign company may be served by registered or certified mail, return receipt requested, or by a similar commercial delivery service, addressed to the company or foreign company at its principal address. The principal address must be as shown on the company's or foreign company's most recent filing with the commission. Service is effected under this subsection on the earliest of any of the following:
1. 1. The date the company or foreign company receives the mail or delivery by the commercial delivery service.
2. 2. The date shown on the return receipt, if signed by the company or foreign company.
3. 3. Five days after the mail or delivery is deposited with the United States postal service or with the commercial delivery service, if correctly addressed and with sufficient postage or payment.
C. If process, notice or demand cannot be served on a limited liability company or registered foreign limited liability company pursuant to subsection A or B of this section, service may be made by handing a copy to the individual in charge of any regular place of business or activity of the company or foreign company if the individual served is not a plaintiff in the action.
D. Service of process, notice or demand on a statutory agent must be in a written record.
E. Service of process, notice or demand may be made by other means under law other than this chapter.