Michigan Compiled Laws, Chapter 500. Insurance Code of 1956 § 500.1917

Sec. 1917. If an unauthorized insurer has assumed a risk and if the premium for that risk has been received by the licensee who placed the insurance, then as between the insurer and the insured, the insurer shall be considered to have received the premium due to it for the coverage, and shall be liable to the insured for any loss covered by the insurance and for the unearned premium, upon cancellation of the insurance, regardless of whether the licensee is indebted to the insurer.