filter api-gateway

Не могу достать значение аргумента.

spring:
  cloud:
    gateway:
      routes:
        - id: auth-server-registration
          uri: lb://authorization-service
          predicates:
            - Path=/identity/registration
          filters:
            - name: AuthenticationFilter
              args:
                requiredRole: ROLE_ADMIN

        - id: auth-server-no-filter
          uri: lb://authorization-service
          predicates:
            - Path=/identity/auth

Пробую так: exchange.getAttribute("requiredRole") - но возвращает null.