@FreePietje It works :) I've just tested it as follows:

1. Launch profanity on Debian and log into server with my admin user;
2. Launch Conversations on LineageOS and "enable" my other, test user;
3. In Profanity, run "/carbons on", then "/omemo gen", then initiate a chat with test user;
4. In Profanity chat window, run "/omemo fingerprint test@<domain>", then "/omemo trust <fingerprint>", then "'/omemo start" (you should see "OMEMO" replace "unencrypted" at top of chat window [1/2]