If you see a white screen or the page hangs before letting you enter your two-factor authentication code, you may be using an outdated browser engine that NetSuite no longer supports.
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Below is an explanation of the issue, its causes, and how to resolve it.

When attempting to log into a CloudExtend application (Outlook or Excel) with NetSuite 2FA enabled, the login screen may:

This prevents successful authentication into NetSuite.

Microsoft Office add-ins (including CloudExtend) are rendered inside a browser engine chosen by Microsoft, not your default browser.
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Which browser is used depends on your:

Two major issues contribute to login hangs:

Many older Windows/Office combinations render add-ins using:

NetSuite no longer supports these browsers, and they do not support the required modern JavaScript (ES6) needed by NetSuite’s login page.

This results in:

Microsoft now requires Office add-ins to use the modern, Chromium-based WebView2 engine.
However, your system may still be falling back to outdated engines if:

To fix this, WebView2 must be installed and enabled.

On Windows:

If installed, you'll see Microsoft Edge WebView2 Runtime listed.

If not present, proceed to Step 2.

Most users resolve the issue simply by updating:

Starting with Office Version 16.0.13530.20424, WebView2 installs automatically (usually within 24 hours).

In case the issue persists even after the updates are installed, please download WebView2 and/or set it as the default rendering component.
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📌 Users can download WebView2 from the Webview2 page on the Microsoft site.

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For organizations on certain Office update channels (Semi-Annual Enterprise Channel, etc.), IT Admins must manually enable WebView2.
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Step 1: Add this registry key:

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\WEF\Win32WebView2

Set value to dword:00000001
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If the WebView2 control is not installed (or the registry change is not made where needed), then add-ins in subscription desktop Office will run in either the older WebView control called EdgeHTML or just “WebView” (also known as “Spartan”), or the “Trident” WebView control that originated with Internet Explorer 11. For details, see Browsers used by Office Add-ins.

For more information, click here for an article from Microsoft with full details.
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If 2FA login continues to hang:

💬 Chat with us (bottom-right of this page)
📧 Email: cloudextend-support@celigo.com