Mailman : impossible to open administration page


My YunoHost server

Hardware: MicroServer HP
YunoHost version: 4.1.8 (stable)
I have access to my server : Through SSH and through the webadmin
Are you in a special context or did you perform some particular tweaking on your YunoHost instance ? : no

Problem description

Mailman application is installed on my server.
Recently, I have upgraded my server (version 3.8 → 4.1), and since, impossible to access to administration page of Mailman.
From Yunohost interface, I can open Mailman page (https://mondomainsecondaire/mailman/listinfo)
When I clic on ‘Go to administration page’ (which is supposed to open the page
https://mondomainsecondaire/mailman/admin), Yunohost homepage opens (https://mondomainprincipal/yunohost/sso/). Impossible to open the administration page, even if I copy/paste the url in a browser.

As suggested in the url above, MAILMAN is not connected to my main domain, but to a secondary domain.

Thanks for your help

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