Steam is Steamworks users verify themselves using SMS. Steamworks is a publishing tool for Steam that lets developers publish their games on Steam. The tool also helps developers implement things such as voice chat, achievements, etc. However, it has been found that some publishers have been pushing out malware-ridden updates after their accounts got hacked.
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Steam SMS Verification
Starting on October 24, 2023, Valve will impose a new SMS-based security check. Game developers must pass this check before sending an update on the main release branch. When someone tries to add new users to the Steamworks partner group, which is already secured by an email-based confirmation, the same need will be enforced. Starting on October 24 on Steam, the group admin will need to send an SMS code to confirm the action.
from now on, The default/public branch of a released app will need to have a phone number associated with their account. This is so that Steam can text you a confirmation code before continuing.
“Any Steamworks account that needs to add additional users will experience the same thing. On October 24, 2023, this modification will become effective.
A steamID is now necessary for confirmation when using the SetAppBuildLive API on Steam. It is no longer possible to manage the default branch of released apps using ‘steamcmd’ to set builds live.
Additionally, according to Valve, there won’t be a solution for developers without a phone number, so in order to continue publishing on the platform, they must figure out how to receive text messages.