[2021] bought the 2 pack ...

It will be in your gift inventory as a giftable item (NOT a cd key to be entered). The gift inventory is easily accessible by clicking the little mail icon in the top right corner near where it lists your username, and selecting "X new items in your inventory.", Then from that menu make sure the "Steam" filter is selected, and in the drop down menu a little lower down you will find a "Gifts" option. You should find the giftable copy there, from which you can select the "Send gift..." button on the right hand side to send it to the recipient of your choice.