receiver unknown when MND is received

Hi all,

I am sending an file using EDIINT send and the partner received the message and sent us the MDN back. But when we received the MDN it says receiver is UNKNOWN but sender is Identified. I am not sure what setting I am missing here. In the content they are sending in MDN iam able to see the AS2-To which is out External ID. Can anyone tell me what I am missing…

make sure this AS2-to ID is defined as your profile’s EDIINT AS2 id. External ID type: EDIINT AS2