While Microsoft has never really clarified the reason the issue occurred, the company said at the time that the inability to login into your Xbox Live account didn’t have anything to do with Titanfall. Since the outage, the company has never really clarified the actual root cause of the problem.
The company has sent out messages to those affected apologizing for the problem and letting users know of the free additional seven days of Xbox Live Gold that they will be giving users for their inconvenience. Apparently only users that were affected on March 11th will be getting the subscription extensions.