I can (obviously) log into these forums, and various other Blizzard sites, however, I’ve been having problems with the Armories so, thinking I just needed to log out and back in again (which sometimes fixes things), I logged out. But now I can’t log back in again.
So I actually raised a ticket on this because I’d done all the other self help things I could think of, including clearing my cache and trying a different browser. Unfortunately that was no help (although I was pleasantly surprised not to get a robot response). All they could recommend was clearing my cache, trying a different browser and, if that didn’t work, report it on the US forums https://us.forums.blizzard.com/en/wow/c/support/website-bug-report/18
So I guess that is that. I’ve reported it … but I don’t expect a quick fix.
This seems to be sorted now? I doubt it was anything Blizzard did (at least, not deliberately) as otherwise there would have been a message doing a bit of back-patting, so I’m guessing it was either incidental, or something just timed out.