Xamarin Android 14从SSO返回时创建空白应用实例问题求助

• 基于Xamarin开发的移动应用，Android 13及更早版本功能正常，Android 14中出现异常：切换Activity或从浏览器完成SSO登录返回应用时，系统未恢复现有进程，而是创建应用新实例，显示带有AndroidManifest标签的空白屏幕。
• 已处理Android 14的BroadcastReceiver变更，排除该因素导致问题的可能。
• 初始逻辑为启动SplashScreen后通过StartActivity(new Intent(this, typeof(MainActivity)));跳转至MainActivity，此操作会创建应用第二个实例并进入登录/SSO流程；调整为直接启动MainActivity后，不会创建新实例，且能正常打开Microsoft登录浏览器窗口，但完成Microsoft账户登录后，未像Android 13及更早版本那样返回原应用，而是再次创建新实例，显示空白页面及标题标签。

SSO登录代码 #

public async Task<UserToken> OnSignInAsync()
{
    UserToken currentUser = null;
    if (publicClientApplication == null)
    {
        this.publicClientApplication = PublicClientApplicationBuilder.Create(ClientID)
            .WithIosKeychainSecurityGroup(AppInfo.PackageName)
            .WithRedirectUri($"msal{ClientID}://auth")
            .Build();
    }

    var accounts = await this.publicClientApplication.GetAccountsAsync();
    try
    {
        try
        {
            var firstAccount = accounts.FirstOrDefault();
            var authResult = await this.publicClientApplication.AcquireTokenSilent(Scopes, firstAccount).ExecuteAsync();
            currentUser = await this.RefreshUserDataAsync(authResult?.AccessToken).ConfigureAwait(false);
            if (currentUser == null)
                throw new MsalUiRequiredException("0","Unable to get current user information.");
        }
        catch (MsalUiRequiredException ex)
        {
            // the user was not already connected.
            try
            {
                var authResult = await this.publicClientApplication.AcquireTokenInteractive(Scopes)
                                    .WithParentActivityOrWindow(ParentWindow)
                                    .ExecuteAsync();
                currentUser = await this.RefreshUserDataAsync(authResult?.AccessToken).ConfigureAwait(false);
            }
            catch (Exception ex2)
            {
                // Manage the exception with a logger as you need
                System.Diagnostics.Debug.WriteLine(ex2.ToString());
            }
        }

        if (currentUser != null)
        {
            currentUser.LoginModelOAuth = new LoginModelOAuth();
            currentUser.LoginModelOAuth.iv = Constants.IV;
            currentUser.LoginModelOAuth.kv = EncryptAES(currentUser.UserPrincipalName, Constants.IV);
        }
    }
    catch (Exception ex)
    {
        // Manage the exception with a logger as you need
        System.Diagnostics.Debug.WriteLine(ex.ToString());
        throw(ex);
    }

    return currentUser;
}

内容的提问来源于stack exchange，提问作者Phil