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?Jan commented
If this is not going to get implemented at least document this and publish the workaround for this. This is a basic requirement and aad b2c is a paid service.
We are working to enable this feature. We should have another update by Dec 2018.