Update:
We’ve transferred approximately 150K players since character transfers went live. A small number of those have resulted in characters with an invalid data state that needs to be corrected. We’ve done that for those affected last night, but there are a still some new transfers affected that we see happening. We have paused character transfers and evaluate how we can prevent future occurrences of this problem. When that is resolved we’ll resume the service, with an announcement ahead of time.