Steam devs will need SMS verification to release game builds

gamedeveloper.com:

Valve will now require Steam developers to use SMS verification. Starting Tuesday, October 24, developers will need a phone number associated with their account before publishing new versions of their game or adding new users to the account. 

Steam will text users a confirmation code if they need to update a game, but a code won't be needed for a game that isn't out yet or is updating a beta version. And for adding new accounts, the main admin account will need to input the code before sending an invite to a new user.

"As part of a security update," wrote Valve, "any Steamworks account setting builds live on the default/public branch of a released app will need to have a phone number associated with their account, so that Steam can text you a confirmation code before continuing. 

"This change will go live on October 24, 2023, so be sure to add a phone number to your account now."

The phone number requirement serves as an extra layer of security similar to two-step verification. In games, the method has been controversial: last year, both Overwatch 2 and Call of Duty: Modern Warfare II used an SMS Protect system where players had to register their phone number in order to access multiplayer.

Both games used the authentication system to verify the number attached to a user's Battle.net account. In the case of Overwatch 2, it was particularly damaging to those with prepaid phone numbers (or who lacked their own personal phone), and Blizzard Entertainment later removed the rule for most Overwatch players.

Earlier this year, the ESRB filed a proposal to the FTC for using facial recognition. Known as the Privacy-Protective Facial Age Estimation, it aims to help verify that anyone buying mature-rated games is a legal adult.

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