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Poland directs officials to ditch Signal in favor of 'secure' state-developed alternative
(www.theregister.com)
This is a most excellent place for technology news and articles.
the article says:
this is standard matrix thing. if you log out of matrix and don't do that, you're greeted with Unable to decrypt message after next login. this is because it's on-prem matrix instance (or instances) with mandatory 2fa (freeotp is an option) and registration process tying matrix identity to national id, and it's intended only for public administration internal use. you can't just walk up and register you have to work there, and as their threat model is about phishing, this does make sense