The first security drone on Europa is at the ziggurat which is locked behind completion of the first 4 Beyond Light campaign steps. You can see it in the first section of Esoterrick's video at https://www.youtube.com/watch?v=4WxPHbcrs_E&t=1126s but I'm pretty sure you already know that's where it is.
People who own Witch Queen but not Beyond Light will not be able to complete the "Drone Destruction I" triumph. This was not a problem for me since I own the DLC but I'd be mighty irritated if I didn't!
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Who owns witch queen but not beyond light ???? who does that ??? if you do that then the drone is the least of your problems....
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I appreciate you reporting this issue to us. We're aware that it's occurring and we're investigating.
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Known, Bungie is working on it