Can't find a game that I just activated with a code

[friedrich.2]

Using a humble bundle code, I activated a game "successfully", but I can't find it in my Library. When I reactivate, using the code again, it tells me that it's a duplicate and that I already own it. Does anyone have an idea what to do in this situation?

It's not a filtering issue and I've logged out and back in to make sure.

[rawWwRrr]

Do you see it when you look at this page:
https://store.steampowered.com/account/licenses/

[xarvn]

Is this about Train Sim World 4 bundle? If so then you need to activate the code for the base game. See:
https://steamcommunity.com/discussions/forum/1/4349988612569301112/