Check that you have unlocked the helmet. Do you own the season which it was released? Lost sectors favor the gear which hasnt been unlocked first, so if you were getting other exotics that you have already, then you may not have access to the gear.
A few seasons were released for free, so in theory you should have access to those items, but I dont know if there is something needed to be done to access the content/gear.
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I've had every exotic. Just got dupes over and over. After 30+ runs I finally got it. Just terrible RNG.
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The system is bad, it was good when there were only a handful of exotics that you could get. But now there are so many that it can take 50+ runs to get one that is worth keeping. The collection rolls are a joke. Hopefully the update in TFS will help, but Im not holding my breath.