python3.6.2 package not found error

[Charxil]

I create conda environment using conda create -n testenv python=3.6.2.
I got the following error. May I know how can I solve the issue?

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

  - python=3.6.2

Current channels:

  - https://repo.anaconda.com/pkgs/main/linux-aarch64
  - https://repo.anaconda.com/pkgs/main/noarch
  - https://repo.anaconda.com/pkgs/r/linux-aarch64
  - https://repo.anaconda.com/pkgs/r/noarch
  - https://conda.anaconda.org/conda-forge/linux-aarch64
  - https://conda.anaconda.org/conda-forge/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.