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@Vamp898 @Igeljaeger
All this exists in XMPP. The matrix uses 1 client on the Chrome browser engine. XMPP a lot of clients and different types of encryption in jabber. In XMPP it is necessary to understand. Write in support, I will help select the XMPP clients and their configuration.
You needed to use OMEMO, not OTR. The behavior described by you is not an error, but the OTR encryption feature