I’ve tried a few more things like disabling addons and hard restarts, but I am still unable to complete this quest, which is unfortunately keeping me from advancing the leveling campaign.
Disabling addons will never fix a corrupted ui you need to do a proper reset by either deleting or renaming the wtf cache and interface folder while logged outa game and launcher.
Thank you for the suggestion, this was my next course of action, but I actually just managed to complete this without having to go nuclear on the WTF and interface folders.
Not entirely sure what was the cause, but I think it may have been the addon Dialog UI (which changes the Dialog window).
I’m glad you were able to solve it! Just for future reference, you don’t have to go completely nuclear. If you rename/move the folders you can restore them after you try a reset. Simply move them back to the original spot.
Most of the time, I can fix these sorts of errors by just deleting the WoW cache folder contents. I save the nuclear option for when things are really upside down.