I was clearing a lost sector in the corrupted strike on my Solar Warlock and got a notification I unlocked a seasonal challenge. I thought it was the challenge for killing strike bosses, but when I went to turn it in there is no challenge listed and I just have a notification. I would post a picture, but I can’t seem to transfer my pictures in links right not.
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There is a challenge from week 10 called Dreaming City Defense that was activated well ahead of time. Unfortunately we'll need to wait until week 10 rolls around before we are able to actually claim this challenge.