X509 and SAML SSO login - metadata file

Hello support team,

I have followed some discussions regarding x509 and SAML SSO login

Where can I define the certificate and private key to be used for signing metadata xml and saml requests? Does Auth0/Okta support this? (exported metadata X509Certificate data is not my client certificate)

using this link to upload the client cert →

https://manage.auth0.com/dashboard/us/dev-gqgxf4ffp3f8kmfe/connections/enterprise/samlp/con_ehKmt2h2uS6k4Zd0/settings

using Addon: SAML2 Web App menu under Applications to export the metadata →

https://dev-gqgxf4ffp3f8kmfe.us.auth0.com/samlp/metadata/9HkEvA9Jl6NkpKXPWRM9wMXKLO43ilmM

Thanks in advance
Best
Ufuk