Please activate 2FA for your Github account until 2026-10-02T13:00:00Z. We will make it mandatory for the RIOT-OS organization until then to avoid security risks. Here is what GitHub says:
Organization members who do not have two-factor authentication enabled will be unable to access resources owned by the RIOT organization, but will remain a member of RIOT until they update their settings. Outside collaborators who do not have two-factor authentication enabled will be removed from the organization and notified. View organization membership to see which users will be impacted.