Internet Explorer Mode in Microsoft Edge blocks access to Lightning Experience

This error appears when Microsoft Edge opens the Salesforce Lightning Experience URL using Internet Explorer Mode (IE Mode), which forces Edge to render the page with the legacy Internet Explorer engine. Lightning Experience requires a modern browser engine and is incompatible with Internet Explorer.

To confirm IE Mode is the cause, open Salesforce Lightning in a fully supported browser such as Google Chrome or Mozilla Firefox. If the error does not appear in Chrome or Firefox, IE Mode in Edge is the root cause.

Disable IE Mode at the Microsoft Edge Browser Level

Use these steps when IE Mode is controlled by individual browser settings (not enforced by company policy):

1. Click the ellipses (...) in the upper right-hand corner of the Edge browser and scroll down to click Settings.
2. On the left side of the Settings page, click Default browser.
3. Under the Internet Explorer compatibility section, select Don't allow from the drop-down menu under Allow sites to be reloaded in Internet Explorer mode (IE Mode).

If this option is unavailable, grayed out, or if disabling it does not resolve the error, your organization likely enforces IE Mode via a group policy.

Disable IE Mode via Company Group Policy

When IE Mode is enforced at the company level through a Microsoft Edge group policy, individual users cannot disable it through browser settings. The user needs to contact their internal IT team to modify or remove the group policy that forces IE Mode for Salesforce URLs.

Salesforce Support does not have the ability to manage this setting. Customers will need to work with their IT team for further guidance.

For more information, see Supported Browsers and Devices for Lightning Experience and Technical Requirements for Lightning Experience