I buy for a group of four season ticket holders, from this year you had to have their permissions and when you have it set up the tickets for these matches are in your account waiting to be purchased.
Edit make sure the people you want to buy for are in your network and you have watched authorisation to purchase tickets for them. From memory when they are in your network you initiate an email request for the permision which they have to approve. Hope I've remembered this correctly I'll try and find a link for