I cannot activate Nuendo 10 trial with usb-elicenser

I downloaded and installed latest elicenser control center, plugged in usb-elicenser, entered activation code but when I click on “download license”, it said “a connection to the license server could not be established, because the license server is currently not available”. I did try on different computer, different network and the problem still exists. I also went online and enter my usb-elicenser serial number, but it was frozen when I click “continue”.
Anyone know what is problem here?

Server is down, multiple reports…