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First of all, create Azure AD. Then setup Cloudflare Access and Tunnel.
Refer
https://developers.cloudflare.com/cloudflare-one/identity/idp-integration/azuread/
https://learn.microsoft.com/en-us/azure/active-directory/fundamentals/active-directory-how-to-find-tenant
https://geeksarray.com/blog/get-azure-subscription-tenant-client-id-client-secret
https://www.roskey.net/2023/02/25/%E5%88%9D%E6%8E%A2cloudflare-tunnel-ssh/
https://developers.cloudflare.com/cloudflare-one/identity/users/short-lived-certificates