inventory.givebp not working

tried with steamid and playername, also tried adding them before the item short name and after (like below).
Is there another way to sell blueprints as an item? Took me days to add those blueprints and it did not work in the end. 

"ammohandmadeshell": {
    "DisplayName": "ammo handmade shell Blueprint",
    "Image": "ammo.handmade.shell.png",
    "Message": null,
    "Command": "inventory.givebp ammo.handmade.shell {playername}",
    "BuyPrice": 1,
    "Currency": "basicblueprintfragment",
    "ShowDisplayName": true