[MM3-users] Re: Mails are not archived at all -- how to check if Hyperkitty is running or not?

I have a similar problem with mailman 3.2.1 (debian package):

# mailman info GNU Mailman 3.2.1 (La Villa Strangiato) Python 3.7.3 (default, Jul 25 2020, 13:03:44) [GCC 8.3.0]

the messages are not archived even if the key is set and hyperkitty is checked as active archiver.

To analyze the problem I set DEBUG = True in /etc/mailman3/mailman-web.py. In debug mode the problem does not occur, but this second problem appears: https://gitlab.com/mailman/hyperkitty/-/issues/84

How can I fix it?