How to pass required claims to OpenID identity provider with Azure ACS?

Question

When looking at the request urls that Azure ACS generates I can see that ACS includes email, fullname, firstname and lastname as required claims. Further, the fullname attribute

Answer 1

Azure gets claims via Attribute Exchange which myOpenID doesn't support according to this blog post by Vittorio.

There's an interesting discussion on the topic over here on the msdn forums.