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Making progress. Working through errors.

Please note: Page 257 - Delegated Authentication is now legacy

To help find the right parameters and values for your system,
log in to Auth0 and go to https://auth0.com/docs/api/authentication

Update: With the latest Auth0 authentication pipeline, this endpoint should not be used to exchange an ID token issued to one client for a new one issued to a different client, or to use a refresh token for a fresh ID token. For more information refer to Introducing OIDC Conformant Authentication > Delegation.