How to replicate a conda environment?

I have successfully installed some python code on a Win10 machine using Anaconda and conda environments and would like to install exactly the same environment on another computer, also Win10.

This page indicates that you can save a file that contains the environment info on computer 1, then recall it on computer 2, using:

1. computer 1: conda list --explicit > spec-file.txt
2. copy the file from the working directory of computer 1 to the working directory of computer 2
3. computer 2: conda create --name myenv --file spec-file.txt

Step 1 works fine for me but step 3 fails with a ResolvePackageNotFound error, listing basically all the packages that are in the text file.

Am I missing something?
Is there a way to semi-automatically install the packages from that text file instead?

Edit: summary from the answers and comments (thank you!):

• if conda install was used to install packages in computer 1, then what is written above is the best way to do an exact replication.
• if pip install was used instead for packages installation (as was the case for me), the chosen solution below is the most appropriate one (conda env export and conda env create)

try using export --

Computer 1 - conda env export > spec-file.yml

Computer 2 - conda env create -f spec-file.yml