I have progressed the challenges so rapidly, that I got enough kindling to put small embers on all my armour pieces before I even got to see that quest.
Now, because it apparently guides through fully upgrading all armour pieces, I have no way to progress the step.
Solution: Detect if someone has done exactly that and make the step skip itself
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I don’t know if it will help anyone else but I completed and turned in a weekly solstice bounty and it fixed itself for me.