I am in the process of updating the ACS Token Request samples per protocol updates in the ACS service from Version 0.8 to 0.9. I will update the samples in the blog, but in case you made your own changes to the samples, here are the updates you need to make...

• Change the STS URI from "https://<service>.accesscontrol.windows.net/WRAPv0.8/"  to "https://<service>.accesscontrol.windows.net/WRAPv0.9/"  
• Change "wrap_SWT" claim type to "wrap_assertion"
• Add "wrap_assertion_format" claim type with claim value "SWT"
• Change "applies_to" claim type to "wrap_scope"