ACS90019: Unable to determine the tenant identifier from the request.

Hi,

I have done a POC on Windows Azure AD, which was working fine before. Now when I run the same POC, it provides error. I am getting the following error message while running the code.

HTTP Error Code:  400 
Message:  ACS90019: Unable to determine the tenant identifier from the request. 
Trace ID:  3892b86b-db84-4c14-bbd2-b7c295f7732a 
Timestamp:  2012-12-21 07:36:11Z

I tried creating a new Service Principal and added replyurl also, but I am getting the same error.

Please let me know where is the issue.

Many Thanks,

Thirumalai M