Hello Andrea,
I would like to suggest that you integrate the adjustmens to the Logout method into this blog post as well. Just by following this discussion I found out the reason why the Logout does not work as expected.
Could you please eloborate how the current Auth0 User can be accessed in blazor pages? Currently the object @context.User.Identity.Name seems to be empty. I would like to show the Name of the user or I would like to add additional claims / roles to the current user object from within my application (roles with finer granularity than Auth0 can provide).