Not working here in the UK (15:25 GMT), hasn't been working since last night for me.
MBP, iPhone and watch prompting me constantly to update my Apple info. MBP seems to be accepting it, although it's prompted me three times today (it seems to be when it locks itself). Getting a mixture of errors or extended progress wheels entering my password on my phone. Have only tried it once on my watch because I have a long Apple password that I usually enter with 1Password, which is impossible to do on the watch (even using the iPhone to enter text, as prompted, doesn't let me paste it in).
Reluctant to sign out of iCloud completely on my phone in case I can't get it back on again.