We are currently aware of and investigating an issue where players are prompted to reactivate their accounts due to suspicious login attempts, but there is no option to enter the activation code. If you are experiencing this issue, you do not need to submit a ticket. We will update this post as soon as more information becomes available. We apologize for any inconvenience this may cause.
UPDATE - This issue has been resolved. Please try logging in again. If you're still experiencing this issue please contact us by submitting a ticket.