I found and claimed the Duty Officer Assignment "Ghosts of the Jem'Hadar #5: Bribe Ferasan for Information about Jem'Hadar in Sector" on two of my characters that needed it, one KDF and the other Starfleet. It isn't mentioned as one of the spots on the STO Wiki, so if anyone with access to it is able to, I'm posting here so they can update it.
It was found on the border of the Cardassia and Defera Sectors when crossing into the Cardassia Sector from the Defera Sector ("North" to "South") on 2021 JAN 09 at around 15:30 PST (23:30 UTC), which was a Saturday.