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I want to, during the sign in flow, ask the user for additional input, which would be used as an inputClaim in one of the next steps of the user journey in a custom policy. The value does not need to be persisted. Ideally, it would be done in the sign-in window, but also could be collected from a separate window.

I am able to modify the sign-up window in this way, though not the sign-in one. Looked up in https://learn.microsoft.com/en-us/azure/active-directory-b2c/customize-ui-with-html?pivots=b2c-custom-policy, but this again describes only the sign-up scenario.

There is a similar question asked by @Zzehan-jurangpathy here Getting user attribute in sign in flow in Azure B2C, though no answer that would actually be helpful.

Mleszek
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You can't modify the standard sign-in flow. It just allows username and password.

You can add an extra page by adding a self-asserted technical profile e.g. here.

rbrayb
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