Why can I no longer log into my Minecraft account?

If I want to log in to the online website and then click on register at the bottom, the page simply doesn't react at all. There's neither that the password is wrong or anything else. It just doesn't come. With a roommate it works. Why is that? I have already changed the browser and the internet several times, and also restarted the pc, without success

Maybe the site is offline right now…

It says above that it works for roommates.

Yes, sorry, I skipped…