Signs an application’s end users in against the customer’s own Entra tenant, so accounts, password policy and MFA remain theirs and nobody maintains a second user list. Your application receives the tenant, the client id, a secret and its redirect URI. What it does not receive is a login screen: the variables configure an OIDC client, whether that’s an oauth2-proxy sidecar or your framework’s own, and that piece still has to exist in the application.
An admin enters these once, and the platform injects them as environment variables at deploy time. Your code reads them. It never sees a login screen or an SDK for this.
ENTRA_TENANT_IDENTRA_CLIENT_IDENTRA_CLIENT_SECRETENTRA_REDIRECT_URI