We have implemented Azure B2C authentication for a Dynamics Power Portal. The sign-in flow has been working seamlessly for the majority of users over the past nine months. However, recently a few users have encountered issues during sign-in. In most cases, users are being redirected to the default error page. One user has been redirected to the “Register your external account” page. From my understanding, this is because B2C is not returning the right claims to the Portal and I am not sure if this is related.