If both applications share the same connection, SSO should work by default, provided the Auth0 cookies are being sent when they try to authenticate on the other app, so the Authorization Server can recognise the user’s session.
If the browser is blocking 3rd party cookies, you would need to have App A, App B and your Auth0 tenant all using the same parent domain so the cookies were seen as first party by the browser.
Auth0 can be routed to via your domain using the Custom Domains Feature:
Now i have an application which uses Inventu FVTerm. I would like to do SSO integration between Inventu and Auth0. Could you please help with the steps to achieve.