So I was questing normally this morning for about 4h with friends, and we reached a point in the story in The Rift where we all had to relog to fix a phasing issue. They logged back in normally, but my character kept getting "Unknown Error". After 5 tries with the same result, I tried to log on my alt, and it also got the same error. Tried all the alts and they all get the error.
My keys have been registered, card added, have no emails stating any issue with my account, and here I am waiting for customer support to call me, and my friends still waiting for me to keep questing.