Usually codes should be redeemable via the Bethesda account (https://quake.bethesda.net/en) or the Steam library. But unfortunately I have no idea what kind of account you get with Game Pass. If all else fails you could try to ping u/SyncError, he's a/the developer and often willing to help. Source: almost 2 years ago

Here you go man! I found this through the official Quake.com home page. Source: almost 3 years ago

I might be wrong, but I don't think it's possible that you can have two towers share the same email. Your best bet would be to either get on the discord and ask there, or email support@ nimblebit.com so they can either tell you whether your second tower was registered, and perhaps give you a hint to the email that it's registered to. Source: about 2 years ago

Tiny Towers - This is one of the first games I've ever downloaded when I owned my very first smart phone. Although it has aged a lot, I still find myself going back to it just for old time's sake, and trying to collect as many establishments as I can. They even have a vegas version if you like playing casino games, like Slots, Poker, or Black Jack. And their newest one being Lego Towers. Source: over 2 years ago

Maybe their other games might suit you https://nimblebit.com. Source: over 2 years ago