I was told by one of the Customer Service rep's on the phone that their servers are down and you can't merge your EA Account with any of your UO Accounts. Now he could have been just fluffing my tail to make me get off the line, but it made sense to me. I keep trying every 2 hours or so, and I'd really like to be able to activate my main account... which I can't do until I get it merged with my EA account.
Lame.