Appium Exception while entering text in power point slide: OpenQA.Selenium.WebDriverException: An element could not be located

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I am new to Appium test automation. I am automating power point windows desktop application.

I am facing exception while trying to click on slide and enter text. Following is the test and exception details.

Please help me to resolve this issue.

Test:

public WindowsDriver windowsDriverSession;

    [SetUp]
    public void Setup()
    {
        if (windowsDriverSession == null)
        {
            AppiumOptions opt = new AppiumOptions();
            opt.AddAdditionalCapability("app", @"C:\Program Files\Microsoft Office\root\Office16\POWERPNT.EXE");
            opt.AddAdditionalCapability("deviceName", "WindowsPC");
            opt.AddAdditionalCapability("platformName", "Windows");

            windowsDriverSession = new WindowsDriver<WindowsElement>(new Uri("http://127.0.0.1:4723"), opt);
            Assert.IsNotNull(windowsDriverSession);
            windowsDriverSession.Manage().Timeouts().ImplicitWait = TimeSpan.FromSeconds(10);
        }    
    }

    [Test]

    public void AddTextToPowerPoint()
    {
        windowsDriverSession.FindElementByName("Blank Presentation").Click();
        windowsDriverSession.FindElementByName("Insert").Click();
        windowsDriverSession.FindElementByName("Home").Click();
        windowsDriverSession.FindElementByAccessibilityId("1071").Click();
        windowsDriverSession.FindElementByAccessibilityId("1071").SendKeys("This is slide title")
        windowsDriverSession.FindElementByName("Subtitle TextBox").Click();
        windowsDriverSession.FindElementByName("Subtitle TextBox").SendKeys("This is slide content");
    }

    [TearDown]

    public void TestClose()
    {
        if (windowsDriverSession != null)
        {
            windowsDriverSession.Quit();
            windowsDriverSession = null;
        }
    }

Note: I am getting exception in the above Test at this line (windowsDriverSession.FindElementByName(“Subtitle TextBox”).Click()

Exception:

Message:
OpenQA.Selenium.WebDriverException : An element could not be located on the page using the given search parameters.
Stack Trace:
RemoteWebDriver.UnpackAndThrowOnError(Response errorResponse)
RemoteWebDriver.Execute(String driverCommandToExecute, Dictionary2 parameters) AppiumDriver1.Execute(String driverCommandToExecute, Dictionary2 parameters) RemoteWebDriver.FindElement(String mechanism, String value) AppiumDriver1.FindElementByName(String name)
Tests.AddTextToPowerPoint() line 39

Element details as below: