I have the exact same issue. I also can't give them to Roscoe. I have done all I can think of. I have brought both SAM and Parvati to NTVUR and have tried all dialogue options with both NTVUR and Roscoe. Is the quest just not fully finished yet? I ask the same question with the quest "Your Primal Heart" on the Murder on Eridanos DLC. It seems like they are not fully completed yet, which is really sad. I am a huge fan of the game and I hope this all gets fixed soon!