--Update: If Werner 99-40 wants to talk to you but gets clammy, try unlocking the Crown of Sorrows raid! --
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OP:
I realize our guardians are pretty popular with the NPCs, but it's going on a few weeks now that Werner 99-40 keeps flashing his icon to speak with me only to, you know, clam up immediately.
I think it's a glitch, but is it possible I've missed something and the trigger for conversation just isn't working right?
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Do you have Calus tokens in your character's consumables? If so, you can store them in the Vault. This may remove the blinking icon, IIRC.