AcquireToken not working after some time

Question

Hi,

I am working in Xamarin forms application.

I am using below code snippet to get token for AAD sign-in.

IEnumerable<IAccount> accounts = await App.PCA.GetAccountsAsync().ConfigureAwait(false);
            try
            {
                if (btnSignInSignOut.Text == "Sign in")
                {
                    try
                    {
                        IAccount firstAccount = accounts.FirstOrDefault();
                        authResult = await App.PCA.AcquireTokenSilent(App.Scopes, firstAccount)
                                              .ExecuteAsync()
                                              .ConfigureAwait(false);
                    }
                    catch (MsalUiRequiredException)
                    {
                        try
                        { 
                            var builder = App.PCA.AcquireTokenInteractive(App.Scopes)
                                                                       .WithParentActivityOrWindow(App.ParentWindow);

                            if (Device.RuntimePlatform != "UWP")
                            {
                                // on Android and iOS, prefer to use the system browser, which does not exist on UWP
                                SystemWebViewOptions systemWebViewOptions = new SystemWebViewOptions()
                                {                            
                                    iOSHidePrivacyPrompt = true,
                                };

                                builder.WithSystemWebViewOptions(systemWebViewOptions);
                                builder.WithUseEmbeddedWebView(false);
                            }

                            authResult = await builder.ExecuteAsync().ConfigureAwait(false);
                        }
                        catch (Exception ex2)
                        {
                            await DisplayAlert("Acquire token interactive failed. See exception message for details: ", ex2.Message, "Dismiss");
                        }
                    }

                    if (authResult != null)
                    {
                        var content = await GetHttpContentWithTokenAsync(authResult.AccessToken);
                        UpdateUserContent(content);
                    }
                }
                else
                {
                    while (accounts.Any())
                    {
                        await App.PCA.RemoveAsync(accounts.FirstOrDefault()).ConfigureAwait(false);
                        accounts = await App.PCA.GetAccountsAsync().ConfigureAwait(false);
                    }


                    Device.BeginInvokeOnMainThread(() => 
                    {
                        slUser.IsVisible = false;
                        btnSignInSignOut.Text = "Sign in"; 
                    });
                }
            }
            catch (Exception ex)
            {
                await DisplayAlert("Authentication failed. See exception message for details: ", ex.Message, "Dismiss");
            }

But after some time, token expires somehow and not refresh. Due to that it always redirect user to MS login page.

My requirement is, It should automatically take the logged in user's details.

You can take reference from this code.

I have also check other options like to directly call api to get refresh token but didn't found anything helpful.

Let me know if anyone have any idea about it.

Thanks in Advance.