You may need to disable SAML authentication from the maintenance console when there is no access to the Unified Manager GUI. This could happen in cases of mis-configuration or if the IdP is not accessible.
You must have access to the maintenance console as the maintenance user.
When SAML authentication is disabled, the configured directory service providers, such as Active Directory or LDAP, perform sign-on authentication. Local users and Maintenance users will be able to access the graphical user interface in addition to configured Remote users.
You can also disable SAML authentication from the Setup/Authentication page in the UI.
If required, access your IdP and delete the Unified Manager server URL and metadata.