Thank you for posting this in Microsoft Q&A.
I understand that you're concerned about a step in the password reset user journey that allows the user to change their username/email, which you don't want to offer to the end user. You're looking for a way to prevent this step from being shown to the user during the password reset user journey.
Yes, you can hide the step to change the username/email from the password reset user journey. By default, even after the email is verified, the user can still select the "Change email" button. To find the name of the button, you can inspect the page source on the sign-up page using a browser tool like Inspect.
If you'd like to hide the "Change email" button, you can modify the CSS to hide the associated HTML elements in the dialog. For example, you can add the following CSS entry to selfAsserted.html and customize the user interface using HTML templates.
<style type="text/css">
.changeClaims
{
visibility: hidden;
}
</style>
For your reference: https://zcusa.951200.xyz/en-us/azure/active-directory-b2c/customize-ui-with-html?pivots=b2c-user-flow
Hope this helps. Do let us know if you any further queries.
Thanks,
Navya.
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