https://winauth.com/2015/06/11/swtor-security-key-google-authenticator/
In case anyone else finds this a bit confusing, the app used for authentication is not made by bioware, nor does it say anything at all about SWTOR, however, The Microsoft Authenticator app from the Microsoft store is now supported as a mobile authenticator on the SWTOR website. Hope this helps! I know not a lot of us use windows phones, but this is a nice feature to have both for the extra layer of security and access to the vendor.