An AOB is an agreement that transfers the insurance claims rights or benefits of the policy to a third party. MANDATORY FIELDS: The following columns of the data call are mandatory fields for insurers with paid claims.An assignment of benefits (AOB) is a legal contract that allows you, as the policyholder to transfer your insurance rights to a third-party (assignee),. Please identify the assignor's preliminary requirements and obligations, including any statutory requirements for completing and filing the schedules of assets.