I created a listing for the Weekly Lightfall Mission: Legend difficultly. We ran the activity, and when I checked my game history, it said that we had done it on Hero difficulty. I believe the Fireteam Finder is bugged.
Workaround: invite players directly from Fireteam Finder to your party, then manually select the activity rather than use the "Summon" function from Fireteam Finder.
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Hi there, thank you for your report. Would you be able to provide a video of this issue occurring? Uploading to a public video hosting site like YouTube works best. Thanks!