Hi JimDawson ,
I am also facing same problem.
1> I have configured the certificate on BizTalk group property.
2> I added the certificate into personal store of current user account having BTSAdmin privilige
3>I added the certificate to send host service accout's personal store.
still am getting the error:
A BTS MIME error was encountered when attempting to encode a message. Error: The Signing Certificate has not been configured for AS2 party. AS2-From: Contoso AS2-To: Fabrikam
Can you please tell me what else i have to do....
Regards
Srinivas