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Where exactly have you tried to activate this key: in Steam launcher, or from browser?
When I had such problem(unknown key that gets me "You already have this game on your account" warning on activation) I got a prompt to install a game this key is from if I did it from Steam launcher.
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For Google Chrome, might work on other browsers as well:
1) Go to https://store.steampowered.com/account/registerkey
2) Press F12 and stay on the Network tab
3) Try to activate the Steam key
4) Click on ajaxregisterkey/
5) Extend purchase_receipt_info
6) On line_items you are able to see the packageid (ID of the package), appid (ID of the app), and line_item_description (Name of the item)
Enjoy!
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Easiest method using SteamDB extension: https://steamdb.info/extension/
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My problem: Have steam key but i dont know what activate - activate on steam - Steam tell me i have already game on acc - but i want know what key activate..
There was in some topic manual to this. Some with Dev console in browser, but i cant find it. Thanks for help :)
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