Blank screen after admin log-in

Greetings from Germany!

My YunoHost server

Hardware: VPS bought online
YunoHost version: 11.2.11.3 (stable).
I have access to my server : Through SSH | through the webadmin | direct access via keyboard / screen | …
Are you in a special context or did you perform some particular tweaking on your YunoHost instance ? : no

Description of my issue

I’ve done a fresh install of Yunohost and configured DNS with lets encrypt.
After I’ve installed question2answer (on a subpath) I can open the page as normal with
https://domain.nohost.me/question2answer/index.php/login?to=
Then I want to log-in as admin. I click on the log-in button at the top right and enter username and password of the admin (as specified before installation). I’ve used the yh admin as the app admin.

After I hit enter, a new, empty pages opens. Nothing is in there.
I’ve activated the browser inspection pane (Network Analysis) and the status states Error 500
Referrer Policy “strict-origin-when-cross-origin”
It sounds like a reverse Proxy issue to me.

There is a register button somewhere hidden, under “Users” and by clicking the user name. I can register with a new username and that works (also with login), but that is not an admin. So I need the admin login in order to change some settings.

I’ve also did a log-in via the SSO portal page and after that clicked on the app symbol. However there was no auto-login with the admin user. I have to use the log-in button and that doesn’t help with admin log-in

I’ve also tried to install the app on a subdomain, without success. Same issue come’s up.

Has someone an idea how I can log-in as app-admin?

PS. I have another YH installation with Question2answer and there things are working fine. But that installation is somewhat old and as far as I know a few app updates happened there already. Problem is, that I need a new, fresh installation.

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