python – Unable to add mamba env to PyCharm due to OK button greyed out

On MacOs using PyCharm Build #PY-232.8660.197, built on July 26, 2023 I’m unable to add conda env as Python Interpreter because the ‘OK’ button is grayed out.

The path exist:

ls -Gflash /opt/homebrew/Caskroom/mambaforge/base/bin/mam*                                                                                                                                                    ─╯
  8 -rwxrwxr-x  1 mc  admin   247B Apr 11 15:29 /opt/homebrew/Caskroom/mambaforge/base/bin/mamba
840 -rwxrwxr-x  2 mc  admin   420K Mar 28 13:36 /opt/homebrew/Caskroom/mambaforge/base/bin/mamba-package

How can I fix this?

EDIT:
It turns out that when I change mamba -> conda in this path it accepts conda .

Still: why mamba is not accepted?