Jan Eden via Mailman-users writes:
I did have the same issue about a month ago[1] with the current versions
That's the thread that Eggert replied to! ;-)
As Mark explains there, the fix is mildly complicated because *both* settings are incompatible with some version or other of django-allauth that Mailman 3 (I think only mailman-web and django-mailman3) claims compatibility with. At some point there will be a release of at least mailman-web that changes both the default mailman-web settings and the required version of django-allauth, but we need to be careful about that.
-- GNU Mailman consultant (installation, migration, customization) Sirius Open Source https://www.siriusopensource.com/ Software systems consulting in Europe, North America, and Japan