Problem with the user_SAML application (version 6.6.0) in Nextcloud version 31.0.4

The Basics

Nextcloud Server version:
    Nextcloud 31.0.4
Operating system and version:
    Ubuntu 24.04 as docker host
Web server and version:
    Server version: Apache/2.4.62 (Debian)
Reverse proxy and version:
    ngingx-proxy-manager
PHP version:
    PHP 8.3
Is this the first time you’ve seen this error? (Yes / No):
    yes
When did this problem seem to first start?
   after installing the "SSO & SAML authentication" application
Installation method (e.g. AlO, NCP, Bare Metal/Archive, etc.)
    Docker container - nextcloud official 31-apache image
Are you using CloudfIare, mod_security, or similar? (Yes / No)
    No

Summary of the issue you are facing:

After installing and configuring the “SSO & SAML authentication” application (user_SAML) and enabling “Allow the use of multiple user backends (e.g. LDAP)”, when accessing the login - the page URI is “/apps/user_saml/saml/selectUserBackEnd?redirectUrl=” - the login method selection is not displayed. Only the page with the theme set in the “Themming” application is displayed.
There are no error messages in the log, Nextcloud is running from the official docker container with the tag 31-apache. This is a new clean “installation” of the mentioned version. “Allow the use of multiple user backends (e.g. LDAP)” is enabled in the user_SAML application as I mentioned. Thanks for the advice.
Petr

Hello @Petr_Haban, you started a topic in support category. Unfortunately you ignored the template and a lot of information to help you is missing. Please edit your original post and add all required details like Nextcloud version, webserver type and version, os version, related log file content. Use the support template.

Without additional information the community members cannot help you.

Regards,
wwe

Hi wwe,

thanks for the reply. The information was there, but not clearly in the text. I converted it to the recommended template.
Thanks

Regards
Petr

Solved! It’s not an application error. Debug mode in the browser helped me. The problem is with cascading styles (CSS). The website theme is white. Specifically, without a background in a white theme. And the login selection form is also white. I installed the “Custom CSS” application and adjusted the style.
Petr

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