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The issue is then most lightly different. You have enabled OMEMO as default and you have a chat with someone who is not in your roster. To solve that, you can try to change default encryption to none and reopen that chat.
We will try to improve this behavior in future version.
I got "There is no trusted device to send message to" when trying to send a message to contact without OMEMO.
Expected behavior Message should be sent (maybe with warning or so)
Desktop (please complete the following information):