[Identity] Save external tokens automatically on every login

When using Identity with an external authentication provider, the tokens are not saved automatically by the default UI.

I had to scaffold the UI and add the following code to OnGetCallbackAsync to get this to work

await _signInManager.UpdateExternalAuthenticationTokensAsync(info);

The tokens also weren’t saved as part of the account creation flow in OnPostConfirmationAsync and following the instructions in the docs seemed to have no effect https://docs.microsoft.com/en-us/aspnet/core/security/authentication/social/additional-claims?view=aspnetcore-3.1

See

                // Include the access token in the properties
                var props = new AuthenticationProperties();
                props.StoreTokens(info.AuthenticationTokens);
                props.IsPersistent = true;

                await _signInManager.SignInAsync(user, props);

[javiercn]

I think so, at least for 6.0.

The external providers flow should work with the default Identity UI, without requiring the user to scaffold the page.

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