Kenny it seems you have set up the ID’s correctly. You may need to check the certs that you have in place for the partner. Did you exchange the correct public keys and are they valid. Did you attach them correctly to the Partner’s profile.
Have the partner send it to you as plain rather than signed or signed and encrypted. If it works as plain then you know the problem has to do with the certs. Then work your way through, send as encrypted and see if that works. Then have them sign and encrypt it.
This should identify where your issue is.
Good Luck.
#Integration-Server-and-ESB#webMethods#B2B-Integration