Case Study: BT achieves secure multi-brand authentication with Kocho and Azure AD B2C

Building a secure multi-brand experience with one of the world's largest Azure B2C deployments

BT Group, the world’s largest telecommunications company in this case study, needed a way to securely authenticate millions of customers across multiple brands and services without creating a fragmented or disruptive experience. Kocho helped BT address this challenge using Microsoft Azure AD B2C as the foundation for its Single Authentication Framework, supporting a more seamless and branded customer journey across EE, BT, Plusnet, and Openreach.

Kocho worked with BT to build and migrate to a secure, scalable authentication platform with single sign-on, MFA, passwordless capabilities, improved monitoring through Microsoft Sentinel, and a staged migration approach for more than 25 million customer accounts and 500+ applications. The results included 5 million customers onboarded and more than 100,000 attacks thwarted in the first few weeks, with monthly active users increasing by 1 million and customer abandonments dropping sharply.