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I want know that ‘what is force authentication?’
my sonarqube version is 8.9.0
Your version is past EOL. You should upgrade to either the latest version or the current LTS at your earliest convenience. Your upgrade path is:
8.9* → 9.9
You may find the Upgrade Guide and the LTS to LTS release upgrade notes for 8.9 to 9.9 helpful. If you have questions about upgrading, feel free to open a new thread for that here.
Regarding your question, per the docs:
By default, SonarQube forces user authentication. You can disable forced user authentication, and allow anonymous users to browse projects and run analyses in your instance. To do this, log in as a system administrator, go to Administration > Configuration > General Settings > Security, and disable the Force user authentication property.
Disabling the Force user authentication can expose your SonarQube instance to security risks. We strongly recommend forcing user authentication on production instances or carefully configuring the security (user permissions, project visibility, etc.) on your instance.