While doing testing with one of the integration partners for AS2 implementation using Logic Apps, we were clueless when partner mentioned that MDNs were not getting processed in their system despite having all the correct settings.
The AS2 Agreement was configured for sending Signed and Encrypted MDN messages in our system.
We recently migrated this AS2 agreement from Biztalk Server and this configuration was exactly same as it used to work with BizTalk server.
After two days of long testing and debugging hours with partner and trying out different permutations and combinations to isolate the issue, we got this working only when we added some text in MDN Text box in Agreement Receive settings as highlighted below:
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