Ie mode edge not working as expected with the latest Edge

Question

Enterprise site list is not updating the right location where .xml file is located. with the latest Microsoft Edge

Version 144.0.3719.115 (Official build) (64-bit).

I am using ie mode edge to open the browser.

Answer 1

Hi Jhun,

Thank you for your quick response.

I tried all the steps that you provided. Still I am having an error.

Group policy update is as expected

The version number in Enterprise site List does not matches with XML

I don't know if the issue is with Edge 144?

Answer 2

Hi Mesfun, Sofani,

Good day. I'm Jhun an independent advisor. In regards with your issue, his is a classic IE mode + Enterprise Site List mismatch, and the symptom you’re seeing (TypeError: Object doesn't support property or method 'initGrid') is a strong clue that the page is not actually rendering in IE mode.

Try to do these steps and see what will fix the issue.

A. Verify the Enterprise Site List XML. Open the XML file directly in a browser.

It must:

1. Be reachable by the Edge client
2. Return HTTP 200
3. Be raw XML, not HTML
4. Use the IE11 engine explicitly

Example minimum valid entry:
<site url="legacy.example.com">
<compat-mode>IE11</compat-mode>
<open-in>IE11</open-in>
</site>

Often common mistakes:

1. XML hosted on SharePoint but requires auth
2. XML URL redirects
3. XML wrapped in HTML (login page, error page, etc.)
4. Missing <open-in>IE11</open-in>

If you paste the XML URL into Edge and see anything except plain XML, Edge will silently ignore it.

B. Force Edge to re-download the site list. You already clicked Force update, but Edge is stubborn.

Do this:

1. On the client machine, close all Edge windows.
2. Open Edge and go to: edge://policy
3. Click Reload policies.
4. Confirm: EnterpriseModeSiteList shows your XML URL InternetExplorerIntegrationLevel = IE mode
5. Then go to: edge://compat/enterprise
6. Check: The site appears in the list It shows Open in IE mode The version number matches your XML
7. If the site does not appear here > the XML is not being parsed.

C. This step is often overlooked, clear the IE mode cache. Edge keeps a separate IE-mode cache.

1. Close Edge.
2. Delete this folder: %LOCALAPPDATA%\Microsoft\Edge\User Data\Default\IECompatCache
3. Reopen Edge.
4. Reload policies again.
5. Open the site fresh.

D. For checking, test IE mode manually. This tells us instantly whether the problem is policy or the site itself.

1. Open the site
2. Click … → Reload in Internet Explorer mode
3. Accept the prompt <Check> If the site works > your Enterprise Site List isn’t applying. <Uncheck> If it still errors > the site is broken even in IE11 mode.
4. Given your error message, this is 99% confident it will work when manually reloaded.

E. Version 144 got stricter.

1. Edge 144 tightened validation: Invalid XML = ignored Redirected XML = ignored MIME type must be: application/xml or text/xml
2. If your XML is served as text/html, Edge 144 will skip it without warning.
3. Check the response headers on the XML URL.

I hope this helps.

Regards,
Jhun