HttpContext.GetTokenAsync("access_token")

AuthenticationProperties authProp = new AuthenticationProperties();
            authProp.StoreTokens(new List<AuthenticationToken>
                {
                    new AuthenticationToken { Name = OpenIdConnectParameterNames.IdToken, Value = newIdToken },
                    new AuthenticationToken { Name = OpenIdConnectParameterNames.AccessToken, Value = newAccessToken },
                    new AuthenticationToken { Name = OpenIdConnectParameterNames.RefreshToken, Value = newRefreshToken },
                    new AuthenticationToken { Name = OpenIdConnectParameterNames.AcrValues, Value = string.Format("idp:{0} email:{1}", model.Provider, model.Email) }
                });

            SignIn(new ClaimsPrincipal(identity), authProp, "oidc");