After returning to the town Winsward with my friends, who are all on the same progress as me, quest wise and level wise, we went to hand in our quests. I noticed the quest was available to me on the map but I decided to visit Miklos Dauti first and hand in a quest. After doing so this quest disappeared from the map and wasn’t available from Sandris Cotheran as it was for my friends and now he just continually tells me he thinks he is on to something, a way to catalyze the fulminate.
I tried relogging, no dice. Still can’t progress on the main story.