; and (bb) only applies to contracts over the simple acquisition threshold as defined in section 2.101 of title 48, Code of Federal Regulations. (B) On a mandatory basis for multiple users of same social security account number In the case of an employer who is required by this subsection to use the verification system described in subsection (d), or has elected voluntarily to use such system, the employer shall make inquiries to the system in accordance with the following: (i) The Commissioner of Social Security shall notify annually employees (at the employee address listed on the Wage and Tax Statement) who submit a social security account number to which more than one employer reports income and for which there is a pattern of unusual multiple use. The notification letter shall identify the number of employers to which income is being reported as well as sufficient information notifying the employee of the process to contact the Social Security Administration Fraud Hotline if the employee believes the employee’s identity may have been stolen. The notice shall not share information protected as private, in order to avoid any recipient of the notice from being in the position to further commit or begin committing identity theft. (ii) If the person to whom the social security account number was issued by the Social Security Administration has been identified and confirmed by the Commissioner, and indicates that the social security account number was used without their knowledge, the Secretary and the Commissioner shall lock the social security account number for employment eligibility verification purposes and shall notify the employers of the individuals who wrongfully submitted the social security account number that the employee may not be work eligible. (iii) Each employer receiving such notification of an incorrect social security account number under clause (ii) shall use the verification system described in subsection (d) to check the work eligibility status of the applicable employee within 10 business