The Mautrix bridge supports bridges that are not linked-devices-only (see https://docs.mau.fi/bridges/python/signal/authentication.html ) i.e. the Mautrix bridge supports bridges as secondary devices and primary devices (via the register command The EMS setup of the Mautrix Signal bridge only supports bridges as secondary devices i.e. linked devices
register
command The EMS setup of the Mautrix Signal bridge only supports bridges as secondary devices i.e. linked devices