Stuck at 97% and have been thinking/trying about other "Activities" that can accomplish this to no avail. The challenge just says "Activities" but seem to only progress via the single rare Public Event.
After the new season, has anyone had any success at progressing this via a different way?
Patrols, adventures, lost sector, strikes, and even the new activity (that is on Mercury?) all do not seem to progress this.
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Try clearing console cache & retry. I was getting progress in lost sector. Also, I don’t believe the sundial activity counts as that’s a separate activity.