Same issue. I initially got error code "marmot" but now I just keep seeing "beagle". I have repeatedly: uninstalled and reinstalled the game, checked the integrity of local game files, verified/repaired the game folder, cleared the steam download cache, scanned my hard drive for errors, changed the download region, and I even ran a 20 minute memory check on my system. I'm out of ideas. I want to play the game, but not this badly. If Bungie can figure this out and let me know, great. Otherwise, this is the only game I've ever had do this.