By Raphael Satter WASHINGTON (Reuters) -Okta Inc, whose authentication services are used by companies including Fedex Corp and Moody’s Corp to provide access to their networks, said on Tuesday that it had been hit by hackers and that some customers may have been affected. The scope of the breach is still unclear, but it could have major consequences because thousands of companies rely on San Francisco-based Okta to manage access to their networks and applications. Chief Security Officer David Bradbury said in a blog post that a customer support engineer working for a third-party contractor had…