So people are saying that vault of glass doesn't work and my theory is that it's because vex heavily rely on time manipulation and for time to be stable in order to function. I bring this up because Kepler is having time anomalies meaning time isn't stable there so it could be affecting the vex causing the raid to not function.
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[url=https://www.bungie.net/en/Forum/Post/264850435/0/0/1]This may answer any questions you have[/url]