Not enough information available to check the authenticity.
The sender field on the event does not match the owner of the device
that established the Megolm session.
An unencrypted event in an encrypted room.
The sending device isn't yet known by the Client.
The sending device hasn't been verified by the sender.
The sender hasn't been verified by the Client's user.
The sender was previously verified but changed their identity.
A machine-readable representation of the authenticity for a
ShieldState.