POSSIBLY SOLVED ISSUE…WORKAROUND.
I started a new thread about the issue with 2.83 not final rendering, to see if someone else had a solution and at the same time continueing to check all settings…and I suddenly got it working, what I did is this…
I did one little change, in the vdb volume properties …I changed from clip to extend, and voila…suddenly it rendered…in final renders.
Then switching back to clip again…and it still renders, so something with the mode settings that isn´t refreshing properly…but this may solve the issues.