The poetry export --help description mentions this:

--with=WITH The optional dependency groups to include.

However, it must also be used to include non-optional groups.

e.g.:

Given the following example pyproject.toml: https://gist.github.com/jonapich/80b8090d610da02d5de5137ca96da253

I get the following trace:

> poetry export | grep tenacity
(empty)

> poetry export --with my | grep tenacity
tenacity==8.2.2 ; python_version >= "3.8" and python_version < "3.12" \

I'm on poetry 1.5.1 on Windows, but it was reproduced on Linux as well.