I'm not sure this is specific to PPPoE, it could also affect hotspot.
I'm sending the reply-message attribute back with my radius resposne packets.
Mikrotik is ignoring it completely.
It would be good if mikrotik could
- 1. Show the reply message in the logs
2. Pass the reply message on to the client
Message: bad username or password
terminating... - user xxxxx@yyyyy authentication failed (6)