You can integrate a Google Workspace (formerly G Suite) account with Cloudflare Access. Unlike the instructions for generic Google authentication, the steps below will allow you to pull group membership information from your Google Workspace account.
Notion cloud application - Google Workspace Admin Help
You must be signed in as a super administrator for this task. Using Security Assertion Markup Language (SAML), your users can use their Google Cloud credentials to sign in to enterprise-clo