Auth0 as Identity Provider?

We use IdentityServer4 as IdP and are now considering using Auth0 for SSO. We have a .net website that is hosted on one sub-domain and a REST API hosted on another sub domain. A chat bot is hosted on a third sub domain.

We want the user, once authenticated on any of the sub domain, to be able to use other sub domains seamlessly without login again.

Any help would be appreciated. We use core.