we have a solution that uses asp.net identity for authentication/authorization. We need to add auth0 SSO identity provider to authenticate external users, while keeping asp.net identity for existing users.
Any code sample of that available?
Hi @info71!
Welcome to the Auth0 Community!
I would recommend looking into this ASP.NET SSO Integration: https://marketplace.auth0.com/integrations/saml-single-sign-on-sso-for-asp-net-using-auth0
Additionally, please see our documentation on ASP.NET and SSO: ASP.NET Core Implementation (Web Apps + SSO)
Please let me know if you have any additional questions after reviewing those links 
Best,
Mary Beth