Installing sklearn doesn't work with either py_install or conda_install

py_install and conda_install worked for pandas but for sklearn, it throws me an error. The whole error doesn't show up in reprex which I've copied and pasted from the console directly.

library(reticulate)
py_install("sklearn")
#> Error: Error 1 occurred installing packages into conda environment r-reticulate

conda_install("r-reticulate", "sklearn")
#> Error: Error 1 occurred installing packages into conda environment r-reticulate

sessionInfo()
#> R version 3.6.1 (2019-07-05)
#> Platform: x86_64-w64-mingw32/x64 (64-bit)
#> Running under: Windows 10 x64 (build 16299)
#> 
#> Matrix products: default
#> 
#> locale:
#> [1] LC_COLLATE=English_United States.1252 
#> [2] LC_CTYPE=English_United States.1252   
#> [3] LC_MONETARY=English_United States.1252
#> [4] LC_NUMERIC=C                          
#> [5] LC_TIME=English_United States.1252    
#> 
#> attached base packages:
#> [1] stats     graphics  grDevices utils     datasets  methods   base     
#> 
#> other attached packages:
#> [1] reticulate_1.13.0-9003
#> 
#> loaded via a namespace (and not attached):
#>  [1] Rcpp_1.0.2      digest_0.6.21   rappdirs_0.3.1  jsonlite_1.6   
#>  [5] magrittr_1.5    evaluate_0.14   highr_0.8       rlang_0.4.0    
#>  [9] stringi_1.4.3   rmarkdown_1.16  tools_3.6.1     stringr_1.4.0  
#> [13] xfun_0.10       yaml_2.2.0      compiler_3.6.1  htmltools_0.4.0
#> [17] knitr_1.25

Error copied from console

Collecting package metadata (current_repodata.json): ...working... done
Solving environment: ...working... failed with current_repodata.json, will retry with next repodata source.
Collecting package metadata (repodata.json): ...working... done
Solving environment: ...working... failed

PackagesNotFoundError: The following packages are not available from current channels:

  - sklearn

Current channels:

  - https://conda.anaconda.org/conda-forge/win-64
  - https://conda.anaconda.org/conda-forge/noarch
  - https://repo.anaconda.com/pkgs/main/win-64
  - https://repo.anaconda.com/pkgs/main/noarch
  - https://repo.anaconda.com/pkgs/r/win-64
  - https://repo.anaconda.com/pkgs/r/noarch
  - https://repo.anaconda.com/pkgs/msys2/win-64
  - https://repo.anaconda.com/pkgs/msys2/noarch

To search for alternate channels that may provide the conda package you're
looking for, navigate to

    https://anaconda.org

and use the search bar at the top of the page.

Start by reproducing the failure from the issue using py_install("sklearn") and conda_install("r-reticulate", "sklearn") on Windows. Review how these entry points pass package names to Conda and compare the captured solver output. Done means the requested package installs successfully or the failure is reported with actionable guidance.