https://community.bt.com/t5/General-email-queries/log-in-secure-authentication/m-p/2459000#M123163 <P>Why, in the name of sanity, has just one of my e-mail addresses (not the primary one) suddenly switched itself to requiring a secure password to be sent to my mobile in order to log in.</P> Wed, 08 Apr 2026 08:33:41 GMT woshappenin 2026-04-08T08:33:41Z https://community.bt.com/t5/General-email-queries/log-in-secure-authentication/m-p/2459000#M123163 <P>Why, in the name of sanity, has just one of my e-mail addresses (not the primary one) suddenly switched itself to requiring a secure password to be sent to my mobile in order to log in.</P> Wed, 08 Apr 2026 08:33:41 GMT https://community.bt.com/t5/General-email-queries/log-in-secure-authentication/m-p/2459000#M123163 woshappenin 2026-04-08T08:33:41Z https://community.bt.com/t5/General-email-queries/log-in-secure-authentication/m-p/2459001#M123164 <P>Most likely because you have two factor authentication set up.</P><P><A href="https://www.bt.com/help/security/two-step-authentication" rel="nofollow noopener noreferrer" target="_blank">Two-step authentication | BT Help</A></P> Wed, 08 Apr 2026 08:40:51 GMT https://community.bt.com/t5/General-email-queries/log-in-secure-authentication/m-p/2459001#M123164 gg30340 2026-04-08T08:40:51Z