Cannot integrate SAML to SonarQube

[lopmuj]

Describe the bug
After following the tutorial's configuration step to integrate Authentik SAML and SonarQube, Authentik shows an error, as shown in the following image.

To Reproduce
Steps to reproduce the behavior:

1. use reverse proxy
2. Install Authentik and SonarQube, using the same reverse proxy but different domain names to access them
3. follow the configuration in the tutorial

5. on the SonarQube page, click save and click the "test configuration" button
6. the error shows up

Logs
log from SAML-tracer

Version and Deployment (please complete the following information):

• authentik version: 2024.8.3
• SonarQube version: lts-community
• Deployment: docker-compose