SSO or Google Secure Ldap in Sonarqube

Can you please tell me how to use google secure ldap or google saml sso in sonarqube?
I couldn’t find any documentation to implement google saml and sso. When i tried using sunnel proxy then it throwed some errors and saml sso was throwing this error “permission denied” —ask the administrator.
Ps- i had assigned roles for new users.

You should jump into your logs/web.log file to better understand the error being thrown.

Here is the screenshot of error and web.log