Finding the final NES006 sample for Failsafe in Destiny 2 is a little tricky, especially as you don't get a quest to acquire it by simply talking to her. Instead, you'll have to grab a mysterious item that's appeared in the Research Bays menu called the Proximity Sensor Alert. This will help you acquire the sample you need and the quest with it...
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Destiny 2: How to get the NES006 sample and summon secret bosses
Source: PC Gamer (opens in a new tab)