Hi Anthony
going through the initial setup at one of our customer sites and also discovered the untools package was never found to be added.
We found we were unable to Add Python Packages using ArcGIS Pro due to 2 issues
- Pro needs to be running with elevated admin rights (UAC environment)
- The customer's outgoing proxy is quite restricted and was not allowing access to conda repositories
- The following addresses need to be whitelisted to allow the packages to be accessed
conda.anaconda.org
repo.continuum.io
52.216.0.0/16 (AWS S3 buckets)
Hope this helps someone else as well.