This is currently not on our roadmap. You can retrieve this value by making a call through the Graph API. If this is needed for your scenarios, please continue voting and we will review at a later date.
We added an extension attribute to the user to store the SignInName in order to avoid having to make another call to the Graph API.
We definitely recognize the popularity of this feature, and we discuss it constantly during the planning phases. However there are certain technical limitations in the system that add a large amount of development cost. Because of the cost and the fact that there is a workaround available, other features get prioritized over this one.
That being said, please keep voting for it. The popularity of the feature does help bring it up and makes us reconsider every time.
Apologies for the delay.
We’re doing some research both on the specifics of this ask as well as what it would take to support this.
Is the ask here to do the same thing that regular Azure AD does (see: https://blogs.technet.microsoft.com/enterprisemobility/2014/12/18/azure-active-directory-now-with-group-claims-and-application-roles/) or is are there different requirements around this for Azure AD B2C?
We have released the public preview for this feature! Learn more about how to use it here: https://docs.microsoft.com/azure/active-directory-b2c/active-directory-b2c-setup-oidc-azure-active-directory
Any update on a time-frame for when this will be publicly available through built-in policies?
This is not planned for the next 6 months. If this is needed for your scenario, please continue voting and we will re-evaluate at a later.
I'd like to see this too. I think one of the issues with this is that it's likely that the passwords might not meet the complexity requirements... and we currently don't have a way to set our own that I know of. One idea around this that we have talked about is to create the user account with during our current login process before the password is hashed. However, this still might fail for the same reason.