Which of the following is not a duty of the Department of Financial Services?

The function of approving and reviewing forms, rules, and rates is indeed a responsibility of the Department of Financial Services, primarily to ensure compliance with established regulations and standards in the insurance industry. The Department is tasked with maintaining order and fairness within the insurance market, which includes overseeing the documentation and financial practices of insurers.

In contrast, the other options are duties that are distinctly related to ensuring ethical conduct and regulatory compliance within the industry. Investigating charges of unethical conduct is crucial for maintaining the integrity of the insurance profession and protecting consumers from fraudulent practices. The supervision of claim activities is significant for ensuring that insurers handle claims fairly and in accordance with policy terms, thus safeguarding the rights of policyholders. Additionally, issuing licenses to agents is fundamental to regulated professionalism in the insurance field, ensuring that agents meet specific qualifications before engaging with consumers.

Thus, while the Department of Financial Services is involved in many key regulatory activities, approving and reviewing forms, rules, and rates is not one of its distinct duties, which makes it the correct choice in this context.