For powerful/pinnacle challenges to appear you need to be ~1510 without artifact bonus
for the seasonal artifact, do you have a screenshot showing your moon missions?
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Is that a new thing I didn’t know daily challenges are behind a power wall
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No it isn't a new thing. For a few seasons at least, maybe more, challenges that reward a pinnacle reward won't appear until you are within a certain range of the season power cap. This is to try to stop you from "wasting" a pinnacle when you are still way below the season cap.