Thanks for the answer.
Changing the mongodb params came from earlier posts on the forum
I take that I could as well include them directly in the
config.sjon as parameters to the uri query.
Yes, I did spend hours on googling this and similar error messages.
No, you can't create any collection manually on admin on MongoDb Atlas.
Neither from CLI nor from web interface.
Have upgraded from M0 to M2 just to see if there would be any impact but it isn't.
The most interesting thing is that the collection
socket.io on admin was not created on local instance in order to get the nodebb to run. I am able to create it locally but setup did not create it.