code: public CMASpace create(String spaceName, String organizationId) {
      assertNotNull(spaceName, "spaceName");
      assertNotNull(organizationId, "organizationId");
  
      return service.create(organizationId, new CMASpace().setName(spaceName).setSystem(null))
          .blockingFirst();
    }
docs: Create a Space in an Organization.
  
  @param spaceName      Space name
  @param organizationId organization ID
  @return {@link CMASpace} result instance
  @throws IllegalArgumentException if spaceName is null.
  @throws IllegalArgumentException if organizationId is null.