Authentication-failed

Hi All,
We are having this issue where our partner can successfully send a file to us but our side can't send to them. We are getting this particular error an inbound MDN from our partner, "Authentication-failed" and "Your message could not be processed". I saw a same issue posted here but there was no particular answer.

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AS2

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Hello,

if your partner sent you an MDN with this content he should know about the reason of the problem as it is his system that rejected the message. Have you asked him?

Regards

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Hi thanks for your response. They are saying that our certificate does not match with the one that we sent. But I doubt coz that certificate is the one we are sending across our suppliers for our testing. So can you confirm that this issue is mainly on the partner's side and not ours?