Your environment.yml file contains build strings and many packages that you most likely do not depend on directly, like:

  - libffi=3.4.4=h6a678d5_0
  - libgcc-ng=11.2.0=h1234567_1
  - libgomp=11.2.0=h1234567_1
  - libstdcxx-ng=11.2.0=h1234567_1
  - ncurses=6.4=h6a678d5_0

This prevents the environemnt from being solvable on e.g. windows, see also this SO post