So in the 'Forsworn Conspiracy' quest there's a bug where Eltrys is killed but the guards that have done it won't speak to you, I've had a look at other forums that have provided solutions for ps4, xbox and PC but none of them work on the Switch version, anybody able to offer a solution?
I had the same problem, I gave up and went doing other side quests and travelling for a while, when I came back it had sorted itself out and a third guard had appeared who furthered the quest. Hopefully this is some help
I had to load a previous saved file and restarted the quest. I did all the investigation, but the one at the Treasury house and I went back to Eltry whenever I completed the investigations and it worked. Hope it helps.