First, in an administrator command prompt, enable unrestricted Powershell script execution (see About Execution Policies):
set-executionpolicy unrestricted
Then makes sure that the conda Script directory in is your Path.
For instance, with miniconda: %USERPROFILE%\Miniconda3\Scripts
.
In a regular Powershell prompt check if conda is working, and update to latest version:
conda update conda
conda --version
# should be conda 4.6.1 or newer
Setup conda for Powershell using the following command:
conda init powershell
Finally, restart powershell. An initialisation script is run every time Powershell starts. You should now be able to activate environment with:
conda activate <my-env>
it works, thanks you!