Hi Avila, I got rid of that edge by separating out the surfaces on either side of it and doing an "untrim" (that's where you select the trim boundary edges and use Delete) then built a new revolve that had a profile curve that was a single segment so it would make one single face when revolved.

Then revolved and trimmed and joined.

Without that edge there it should be easier to make a fillet go throught there:





- Michael