You either have 80 resonant already in your inventory, or your inventory is full. You can dismantle them if you already have resonant in your inventory
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That was indeed the issue. I missed the "Not enough Space" message and focused on the "this currency can not be obtained" text, and didn't think to check my inventory. Clearing out the 80 resonant I already had let me accept it from the quest and complete it. Thank you very much!