Might be a problem with the Graphisoft website.
I just signed in to my Graphisoft ID and I got a quick flash of an error message (couldn't catch what it said), but then it went away and I logged in OK.
Maybe try a different browser if you can.
I find sometimes their websites are a bit finicky with certain browsers.
I find Mozilla Firefox work pretty well.
One of the forum moderators. Versions 6.5 to 25 Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10 Dell Precision 3510 - i7 6820HQ @ 2.70GHz, 16GB RAM, AMD FirePro W5130M, Windows 10