Often I want to use newly created conda enviroments also from Jupyter. Therefore the enviroment needs to be added as kernel to Jupyter. You do that like so.
First make sure pip and ipykernel are installed / up-to-date.
> conda install pip > conda install ipykernel
And then enter:
conda activate <env-to-add> > python -m ipykernel install --user --name <env-to-add> --display-name "<env-to-add>"