From GameWatcher: “Fallout 76’s Wild Appalachia Update, the first major content serving for the title, introduces a number of new quests that players can tackle. One such quest is Wolf in Sheep’s Clothing, which sends you to the Garrahan Estate. As you progress through it, you’ll be asked to find a Fallout 76 Recall Keycard Circuit Board in order to make an Assaultron Recall Card.”
Source: N4G PC Fallout 76 Recall Keycard Circuit Board – Where to Find The Keycard Circuit Board?