}
            final AzureAdAuthenticator authenticator = ComponentUtil.getComponent(AzureAdAuthenticator.class);
            final String refreshToken = authResult.getRefreshToken();
            authResult = authenticator.getAccessToken(refreshToken);
            authenticator.updateMemberOf(this);
            permissions = null;
            return true;
        }

        }
    }

    public AuthenticationResult getAccessToken(final String refreshToken) {
        final String authority = getAuthority() + getTenant() + "/";
        if (logger.isDebugEnabled()) {
            logger.debug("refreshToken: {}, authority: {}", refreshToken, authority);
        }
        ExecutorService service = null;
        try {

            // TODO validate signiture

            final Map<String, Object> attributes = new HashMap<>();
            attributes.put("accesstoken", tr.getAccessToken());
            attributes.put("refreshtoken", tr.getRefreshToken() == null ? "null" : tr.getRefreshToken());
            attributes.put("tokentype", tr.getTokenType());
            attributes.put("expire", tr.getExpiresInSeconds());