Logs are hereDo you have the mac address in the local database? Does it have a password?
Enable hotspot verbose logging. Maybe the log will help you see what is happening.Try a login and check the log.
/system logging add topics=hotspot,debug action=memory
Is there any idea what to do from beginning to end, I am newbee at mikrotik.That looks like that mac address is not in the database or the format is incorrect. Looks like it is also checking a RADIUS database with the same result: "User not found".
However it displays the mac address in the log is the format. Should be
/ip hotspot profile set X login-by="mac,http-chap" /ip hotspot user add name=XX:XX:XX:XX:XX:XX