Hi,
Yes, it is possible to delegate authentication to SAML Identity Provider in Denodo Express 8.0. For setting up **SAML Authentication**, I would suggest you to check the [SAML Authentication](https://community.denodo.com/docs/html/browse/8.0/vdp/administration/server_configuration/server_authentication/saml_authentication/saml_authentication) section under the "Administration > Server Configuration" menu.
After configuring the authentication, I would [invoke the web services with SAML Authentication](https://community.denodo.com/docs/html/browse/8.0/vdp/administration/publication_of_web_services/invoking_the_exported_web_services/invoking_the_exported_web_services#invoking-web-services-with-saml-authentication) for obtaining metadata.
You can take a look at the [Restrictions of Denodo Express](https://community.denodo.com/docs/html/browse/latest/platform/installation/appendix/limitations_of_the_denodo_express_license/limitations_of_the_denodo_express_license) section of Denodo Platform Installation Guide to know more about the limitations of Denodo Express.
Hope this helps!