Have you left the area, or teleported back to the Lady Vengeance?
If that doesn't help, please email supportdos2@larian.com, with a brief description (or link to this topic) and your latest save (or a Dropbox or Google drive link, etc), and if available, your most recent save before completing that quest.
Each save is a folder in the '..\Documents\Larian Studios\Divinity Original Sin 2\PlayerProfiles\<ProfileName>\Savegames\Story' folder.
In Windows Explorer you can zip file(s) and folder(s) by right clicking on it/them and selecting 'Send To | Compressed (zipped) Folder'.