Season 3 will most likely be in a contract with Netflix
You would not be able to buy it on DVD for a while.
As an example season 2 was released on netflix on may 6th 2016 but did not get released to DVD until Feb 2017 . 9 months later ...
Season 3 was released on Netflix 24/3/17
AS you gave us very little detail I am assuming you are asking why your password was not accepted ?
Accepted to what I am assuming you meant to say netflix
as you failed to mention what the passwork ? was for ???
Caps lock may have been ON or off when you set up your password ?
suggest if the mystery service is netflix that you ask netflix for help
go to www.netflix.com
then at bottom of screen is a link help centre at bottom of web page
then on the right hand side of the help centre screen is a link
labelled getting help signing in
under the quick links