I actually came from here to this question: https://community.anaconda.cloud/t/issue-updating-anaconda-cant-open/70182
Unfortunatedly they used the wrong quotation marks, so you get an PackagesNotFoundError for "“anaconda-cloud-auth"
You have to type (use "..." insted of “...”):
python -m pip uninstall anaconda-cloud-auth
conda update conda
conda install "anaconda-cloud-auth>0.5.0"