Fair Warning Act of 2022 This bill bars an employer from ordering a site closing or mass layoff until 90 calendar days after the employer has served written notice of such an order to (1) each representative of the affected employees as of the time of the notice or each affected employee, (2) the Department of Labor and the governor of the state where the site closing or mass layoff is to occur, and (3) the state or entity designated by the state to carry out rapid response activities.