The above happened to me last year @ricolly when I was doing a test-run for getting tickets for going to a game this season. I'm not sure if it's a problem with being in the UK perhaps? I got my tickets for the Arizona game in October this year a few weeks ago using TicketExchange as I had the same problem as you have now.
Hi Guys, Eagles fan from Edinburgh, Scotland here. Planning to come over for my first game in 2017 spending 4/5 days in Philly doing the touristy stuff, stadium tour etc. But my question is about tickets, if I can't get any on the day they are released (I understand they sell out very quickly) is the NFL Ticket Exchange reliable for purchasing tickets? Thanks in advance for any help/advice.