After adding a contact omemo does not work our of the box.
Andrzej Wójcik (Tigase) commented 3 years ago
This is quite old issue and OMEMO was changed (improved and fixed) a lot since then and I have no idea what is wrong (link points to the new site and there no info about the issue)
https://help.tigase.net/support/tigase/ShowHomePage.do#Cases/dv/3639001cae4b554657cbf8f855b66d467cbc5512b4d99f78
After adding a contact omemo does not work our of the box.