I have been trying to joint Finnair Plus through their website but unfortunately it is not accepting any password that I tried to create. It keeps coming up with the error message "Please make sure your password does not contain your first name, middle name, family name or Finnair Plus membership number" which it doesn't. I've spoken to their UK customer service agent twice, contacted them via webchat and sent email to them at [email protected]over the last week but the problem remains unresolved. What else can I do to get this sorted?