I'm using IdentityServer4 with Asp.Net Core Identity. In Identity Server I enabled GOOGLE as external provider. I'm able to LOGIN with GOOGLE. The first time I try to LOG IN with GOOGLE the Identity Server shows to me the pages of the GOOGLE where I can choose the account or insert my credentials.
When I LOGOUT I receive the message that I'm logged out but when I try to LOGIN again with GOOGLE I'm directly logged in without to enter my credentials and if I have more than 1 GOOGLE account I'm not able to choose a different one.
This happens both if I connect directly to the server from the Login screen and if I do it via AuthRequest in Expo native app calling endsession endpoint with id_token_hint enhanced.
Why? I'm getting crazy.
I found this solution:
await WebBrowser.openAuthSessionAsync("https://www.google.com/accounts/Logout?continue=https://appengine.google.com/_ah/logout?continue=http://myIdentityServerEndSessionEndpoint", "exp://myReactNativeApp");