I just downloaded this last night, with my season pass. I didn't play it yet. I ran into two issues downloading it. The first time I tried, I got an error message that said that my account was locked from purchasing content. I tried again a minute later and it started downloading, but when it got to 99%, I got an "unable to download" error. I tried a third time and it downloaded, but I haven't tried playing it yet. That's my plan for tonight. Were you able to download and not play? Or unable to download at all?
I'm downloading the game now, it's going fine so far, but I'll let you know if I hit any snags.
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So an update on my situation:
I went to Xbox.com on a hunch and checked my transaction history, the last two transactions that show up are Game of Thrones: Iron from Ice and Tales from the Border Lands: Zero Sum. For whatever reason I didn't get charged for the season pass. My Xbox One acknowledges that I have the season pass and it shows up as installed (I can't "buy it" again either). I even called my Credit Card Company and there is no record of a transaction taking place for the Game of Thrones Season Pass.
I just said screw it and went ahead and bought Episode 2, because you know, they deserve money for their work. I also decided that if some sort of charge does show up for the season pass in the future that I'll just contact Microsoft and have them refund me for the Pass and just buy each episode individually as I currently plan to do (if they refuse to do that and a chargeback on my credit card isn't an option, then I'll just wait for all future TellTale games to come out on disc and snag them off Ebay so that I can play them and that TellTale doesn't get my money. Short term gain for them, long term loss. I don't really want to go that route as I like to support video game companies, but I am also not a fan of getting screwed).
So, if you are having issues with the season pass on your Xbox console be sure to check your transaction history and see if you've been charged for it (Maybe Telltale is refunding us for our purchase to fix it?).