This title does not apply to: a person while acting under a judgment or order of a court; a public officer while performing the duties of office; a person while engaging in a single transaction that involves the sale or lease of any real estate under a power of attorney executed by the owner of the real estate; a licensed auctioneer while selling any real estate at public auction; an owner or lessor of any real estate while managing, leasing, or selling the real estate, unless the primary business of the owner or lessor is providing real estate brokerage services; or a person while acting in the capacity of: a receiver; a trustee; a personal representative; or a guardian.