Just a quick and messy post since I'm on my way to a concert, BUT I can't add Vouchers to my Vault. It says I have zero in my inventory but I definitely have at least a few hundred of each.
I'm still poking around but I wonder if this is an issue with all soulbound items since we intentionally can't add quest items (bummer) and those are all soulbound, like, the code looks for the soulbound qualifier or something to judge whether an item is valid to be stored or not. That's the only thing I could think of off the top of my head. Back to testing!
