Current testing scenario:
2 users, each logged into ejabberd server from macos (monal) and android (conversations). OMEMO enabled on all devices.

Correctly working when sending messages from conversations on android. Encrypted messages are received and correctly decrypted on android and macos.

Incorrectly working when sending messages from monal on macos. Encrypted messages are received and decrypted only on android. The receiving macos client displays error "Message was not encrypted for this device".

It would seems that monal is not using all omemo keys when encrypting the messages. Hopefully this can be fixed?