According to the API, you have already completed all Mercury adventures. Once they are completed, the flag is removed from the map. Only way to access adventures is to pick up the heroic versions from Brother Vance (during Mercury Flashpoint).
You should be able to complete your bounty by doing either Mercury strike.
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thanks for the explanation. i'll try that strike (not sure i'm able to bump up difficulty level) and see if that resets being able to run those stories . many thanks again