docs: String jwtAudienceElementCheck(List<String> allowedAudiences, List<String> audiences) {
          if (allowedAudiences == null) { // handle Point A.
              for (String audience : audiences) {
                  if (oidcClientRequest.isPreServiceUrl(audience)) {
                      return audience;
                  }
              }
              return null; // Point B.
          }
          // Point B.
          for (String audience : audiences) {
              for (String allowedAud : allowedAudiences) { // this is not null when created in the configuration instnce
                  // ALL_AUDIENCES.  Point D.
                  if (allowedAud != null && allowedAud.equals(audience))
                      return audience;
              }
          }
          return null;
      }