private String scopeClaimName() {
        String scopeClaimNameValue = option(SCOPE_CLAIM_NAME_OPTION);
        return Utils.isBlank(scopeClaimNameValue) ? "scope" : scopeClaimNameValue.trim();
    }
Return true if this instance has been configured, otherwise false

@return true if this instance has been configured, otherwise false
clients/src/main/java/org/apache/kafka/common/security/oauthbearer/internals/unsecured/OAuthBearerUnsecuredValidatorCallbackHandler.java