This is likely a mistake:

In my my_script/config/config.yaml I added the following:

searchpath: - pkg://my_lib.config - pkg://my_lib.config.config_group_B

Search path elements should not be nested. if you want to compose configs in config_group_B you should just refer to them with their full relative path in your search path, e.g config_group_B/some-config.

About your actual quesiton: Can you provide a complete minimal runnable example (code and configs)?