AK9-X | Group Rejected (Decryption Content Unreadable)

AK9 “X” is a group-level rejection tied to encryption/decryption handling or post-decryption parsing. It usually indicates mismatched encryption settings, a corrupted payload, or an incompatible security configuration.

Step-by-step fix

1) Confirm you encrypted to the partner’s current public key/certificate.

2) Verify signing/encryption algorithms and any compression settings required by the partner.