Thank you for your patience. We have released custom domains for Azure AD B2C to public preview.
Documentation can be found here: https://docs.microsoft.com/en-us/azure/active-directory-b2c/custom-domain?pivots=b2c-custom-policy
An error occurred while saving the commentPavitra commented
Any update on this? We are using B2C and user wants to see their domain instead of microsoft while signing in. Is that possible?