Unsolved Can't add Bannerlord to my games using my steamkey

Swingin_Ax

Recruit
WBNWVC
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Every time when I use my key here, it gives me a 404. The code I've bought from steam and is in my library. Why can't I use Mount and Blade II Bannerlord's key in my games?
 

WOLFGEIST

Regular
M&BWBWF&SNWVC
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Did you figure this out? I don't even have a key to Bannerlord that I can find. The only key I have is from 2005 when I first bought M&B lol.