Resolved - UnsatisfiableError: The following specifications were found to be incompatible with each other

I encountered an error creating a conda envrionment when following single cell best practices tutorial available at:

https://www.sc-best-practices.org/introduction/raw_data_processing.html#a-real-world-example  

Below is the issue:

conda create -n af_xmpl -y -c bioconda python=3.9 salmon alevin-fry pyroe

Collecting package metadata (current_repodata.json): done

Solving environment: failed with repodata from current_repodata.json, will retry with next repodata source.

Collecting package metadata (repodata.json): done

Solving environment: | 

Found conflicts! Looking for incompatible packages.

This can take several minutes.  Press CTRL-C to abort.

failed                                                                                                                                                      

UnsatisfiableError: The following specifications were found to be incompatible with each other:

Output in format: Requested package -> Available versions

Below commands did not work!

conda update --all --yes
conda config --set channel_priority flexible
conda config --set channel_priority false

conda create -n af_xmpl 

conda activate af_xmpl
conda install -c bioconda python=3.9 salmon alevin-fry pyroe

The following command worked when I added -c conda-forge

conda create -n af_xmpl 
conda activate af_xmpl

conda install -c conda-forge -c bioconda python=3.9 salmon alevin-fry pyroe