Can't 'create account' for developer forums. (iOS)

I have an iOS dev membership, and everything else is working. But I can't access the developer forums.

 

I get stuck at the Create Account screen where I have to "Specify a Screen Name". I choose a screen name, press the Create Account button, a wait spinner appears and then nothing happens. No error message, and no access.

 

Anyone else having problems accessing the developer forums?

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