As seen in https://www.twitch.tv/smokindank5280/video/340403455 around 1:31:30, when the player clicks on an instance of quest K0C00Y07, fast travel to "Ruins of Coppersmith Grange" is selected, but its not mentioned in the quest, so not revealed, hence fast travel fails ("there's no place by that name...").
Full text of the quest:
Buckingford of Andywyr's Quality Equipment Store, Daggerfall has sent me with a Diamond to ransom his lover, Dunard Gaerhouse from the Thieves Guild. The ransom must be paid in 39 days or they will kill Dunard Gaerhouse.
Carolara Kingham is the agent of the kidnappers who awaits me in The Woodsly Residence in Oxworth.
Of course, Perard Buckingford wants me, if possible, to rescue his lover without paying the ransom