My daughter and I are heading to Andalucia in March and have just booked our entrances to the Alhambra - both day and night (we will be there several days). I read all I can find here (as well as Rick's book) and advice from this forum has been invaluable on many occasions.
So I wanted to post about what I was having trouble with and couldn't find tips about. I used the website http://www.alhambra-patronato.es and purchased my daytime tickets with no trouble. My Cap One card went through fine and found my ticket confirmation in Spam (thanks for info!) However when trying to purchase my night visit tickets in exactly the same way, the link on that page did not work. After searching trip advisor for help also, someone suggested this link and it worked perfectly. Both went through TicketMaster.
Most people may know this; but it sure helped me so thought I would share, in case anyone else was having the same difficulty.