A Florida single agent owes the principal all duties EXCEPT:

Loyalty is one of the core fiduciary duties explicitly owed by a Florida single agent to the principal under §475.278(1)(b), requiring the agent to act solely in the principal's best interest, so it cannot be the correct exception.

Confidentiality is a required duty of a Florida single agent, obligating the agent to protect all confidential information shared by the principal, including motivation to buy or sell and acceptable price ranges, so it is not the exception.

Full disclosure is explicitly listed as a fiduciary duty of a single agent under Florida law, requiring the agent to disclose all known facts that materially affect the value of the property and are not readily observable, so it is not the exception.