[MM3-users] Re: The 'flufl.lock>=5.1' distribution was not found, but flufl.lock 8.0.2 was installed

I'm not sure if this will fix it.

I think the issue is that flufl.lock switched to PDM and pkg_resources can't actually deal with it. Using importlib_resources fixes it.

I created a fix for authheaders: https://github.com/ValiMail/authentication-headers/pull/28