I speak to people about doing side quests for the vampires, but whenever I try and speak to Feran Sadri the only dialogue is 'What do you have for sale?' Any help would be greatly appreciated.

Got a problem with this with Vingalmo -.-

vampire radiant quests are broken,hopefully beth will fix

Its recommended to save after completing each radiant quest as they are generated randomly supposedly and if one doesn't work you can reload to make it work.