Thanks again for taking a look at this.
What is odd is that I don't have an Anaconda environment for arcgispro-py3 at Anaconda\envs. I removed my F:\Anaconda\.. references from the PATH system variable. I received the same error when trying to upgrade my arcgis package ("Package not found: 'arcgis' Package 'arcgis' is not installed in F:\Anaconda3\envs\arcgispro-py3").
I uninstalled Anaconda and received this error when attempting to upgrade: 'The system cannon find the path specified.'
I can still use python in Pro, so it is still recognized. I think there is an issue with the activate.bat file. I'm going to uninstall/reinstall Pro and cross my fingers. It won't be fun doing this in a production environment but hopefully it fixes the issue.