TSP Two-step authentication mandatory before the end of 2019
Snippet of Article: "...(December 4, 2019) All TSP participants must have validated contact information and use two-step authentication to log into My Account before the end of 2019. You can avoid interruption to your account access by adding these security features in your My Account Profile Settings now. Download instructions (pdf)PDF file. Two-step authentication helps protect your account against fraud. This login process is more secure because it means that online access to your account requires something you know (your account number or username and password) and something you have (the one-time code you receive in your email or on your phone). Someone who tries to log into your account fraudulently won’t be able to gain access without the code. We recommend that you include at least one contact method on your account that will stay with you through career, such as a personal email...."
Source: www.tsp.gov