Same thing that's happening to everyone else who's posted. It appears that either Multimach or Tusk of the Boar or one of the reprised weapons isn't counting to the progression. It'd be nice to get a fix in sooner rather than like a year from now, considering how many people are just dead stuck not being able to complete the Iron Lord seal through no fault of theirs.
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Hi there, Thanks for reporting. The team is already aware of this issue and is now being investigated.