An incorrect format has been used.
The RFID card is not in the local whitelist. In order for the RFID card to be recognized, it must be taught in.
For charging network (x-series): The RFID card must be taught in at the master charging station in the webinterface.
With a single charging station (c-series): The RFID card must be taught in directly at the charging station.
When connecting to an external OCPP backend: The RFID card is not in the whitelist of the OCPP backend. In order for the RFID card to be recognized, it must be stored on the OCPP backend.