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I am working on a Word Add-in and using the Office Dialog API. A few days ago, everything was working perfectly, but since yesterday, the dialog box is showing a blank screen. I cannot inspect or see the UI.

Here is my dialog.html:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Dialog Box</title>
    <script>
        function showData() {
            document.getElementById("data").innerText = "Hello from the Word Add-in!";
        }
    </script>
</head>
<body onload="showData()">
    <h2>Word Add-in Dialog</h2>
    <p id="data"></p>
    <button onclick="Office.context.ui.messageParent('Dialog closed')">Close</button>
</body>
</html>

And here is my App.jsx:

import React from 'react';

function App() {
    function openDialog() {
        Office.context.ui.displayDialogAsync("https://localhost:3000/assets/dialog.html", { height: 50, width: 50 }, function (asyncResult) {
            let dialog = asyncResult.value;
            dialog.addEventHandler(Office.EventType.DialogMessageReceived, function (arg) {
                console.log("Message from dialog:", arg);
            });
        });
    }

    return (
        <div>
            <button onClick={openDialog}>Press here</button>
        </div>
    );
}

export default App;

Note: The path is 100% correct and was working fine before, but now it opens a dialog box that is completely white without any data. Here is a screenshot of the issue: dialoguebox screenshot

Additional Details:

I am using Office.js for the Word Add-in.

The issue started occurring suddenly without any changes to the code.

I have tried clearing the cache and restarting the application, but the issue persists.

Question: Has anyone encountered a similar issue with the Office Dialog API? What could be causing the dialog box to show a blank screen, and how can I resolve it?

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