[MM3-users] New messages are not archived - may be a path issue

(I read thoroughly https://lists.mailman3.org/archives/list/mailman-users@mailman3.org/thread/2... "New messages not being archived", but could not find what's wrong on my machine.)

This is what I found in /var/log/mailman3/mailman.log : HyperKitty failure on https://mail.opteryx.org/mailman3/archives/api/mailman/archive: This page either doesn't exist, or it moved somewhere else.

I have double checked all settings in the /etc/mailman3/ configuration files and are not able to get message archived. There is not REST error message any more, but perhaps a problem with the paths. I have no idea any more where to fix this.