I think it may be tied in with the nightfall effect. If you already have the blue flames from the nightfall the jackolyte will not display on that character, however the effect does continue for the 30 minutes.
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Incorrect, works with the NF. It's actually intermittent when it works. Worked the first time I tried it yesterday (in the tower), then when I tried one on the same character several hours later (in the tower again) it didn't work. Tried it again this morning, same character, and it worked. Had done NF before I tried it the first time, I see it with the blue flames coming through.
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Hmm, used 5 for me, no such luck. Maybe RNG applies here as well lol.