Problem with codeblocks not rendering in Microsoft 365 Copilot

Question

Problem with codeblocks not rendering in Microsoft 365 Copilot

Ole Slupphaug 60

Hello,

I am experiencing an issue with Microsoft 365 Copilot where code blocks are not rendering correctly.

When Copilot generates a response containing a code block, the code block area only shows animated/pulsing placeholder lines and the content never appears. Regular text render normally and inline code snippets renders sometimes, but full code blocks do not.

Environment

The issue occurs in:

Microsoft 365 Copilot in a web browser (Microsoft Edge)
Microsoft 365 Copilot desktop application

What I have tested

Repaired the Copilot application from Windows Settings
Cleared browser cache and site data
Tested with different chats/prompts
Verified that the user has the required Copilot license assigned
Verified that no obvious Copilot-related policies or restrictions are blocking access
Signed out and back in
Restarted the device

Additional observations

Standard text responses render correctly.
Inline code formatting renders correctly sometimes, but not always.
The affected area remains as pulsing/loading placeholder lines indefinitely.
The behavior is consistent across both the browser and desktop app for those affected.

Has anyone else encountered this issue recently, or is this a known problem with the Copilot client rendering code blocks?

If there are any logs, diagnostics, or additional troubleshooting steps that Microsoft recommends, I would be happy to provide more information.

NxKo 5 Reputation points

2026-08-06T13:44:52.7033333+00:00

Still doesn't work, now Even english causes problems. Microsoft is not what it used to be, enshitification of products is real, even for premium users
Alexandros Kanakaris 41 Reputation points

2026-08-06T19:54:29.22+00:00

I had the same issue. I disabled the following extensions on Edge.

https://microsoftedge.microsoft.com/addons/detail/centro-365/ampgmpmlobbbhjoplcbdfcgplbkbmked

https://microsoftedge.microsoft.com/addons/detail/saml-wsfederation-and-o/boffpaecgbbojpkboijhbmhecoefdehi

The problem seems to be resolved (fingers crossed).
John H. Embretsen 0 Reputation points

2026-08-07T08:07:17.96+00:00
I observed the same issue, and changing from Norwegian to English (US) language in browser settings fixed it for some time. Now it is back regardless of language settings.

I have only tested this in Chrome for now, in one network.

I have run some tests along with Copilot Chat, and have found the following:

Some formatted content blocks remain displayed as gray animated placeholder lines indefinitely.

The issue is intermittent and affects only some blocks within a response.

The missing content is not available through Ctrl+A / Copy, indicating the content never reaches the rendered DOM.

Browser console (F12 --> Console)

Observed repeatedly:

Virtualizer index less than zero, cannot render child rows

Virtualizer index less than zero, cannot update child array

Also observed:

An iframe which has both allow-scripts and allow-same-origin...

Hovering over links in the Copilot response caused additional console messages to appear, including:

The current string map is empty.

The string is probably resolved too early, at import time.

Key: datetime-formatting.timeFormatStrings.monthAndDate

Unclear if this is related or not.

Experiments performed

Test 1

Different formatting types.

Results:

Plain text: rendered

Tables: rendered

XML: rendered

JSON: rendered

Shell code block: failed

Test 2

Additional formats.

Results:

bash: rendered

shell: rendered

sh: rendered

sql: rendered

yaml: rendered

xml: rendered

python: rendered

javascript: rendered

Failed:

powershell

json

no-language code block

This contradicted the initial hypothesis that the issue was shell-specific.

Test 3

Duplicate-content test.

Three identical blocks of the same type were placed in one response.

Results:

Identical block #1: failed

Identical block #2: rendered

Identical block #3: rendered

The same pattern was observed for JSON and PowerShell blocks.

This demonstrates that identical content can both succeed and fail within the same response.

Test 4

Position test.

Ten identical blocks:

A: rendered

B: rendered

C: rendered

D: rendered

E: rendered

F: failed

G: rendered

H: rendered

I: rendered

J: rendered

Only one of ten identical blocks failed.

Conclusion

The issue does not appear to depend on:

content

language tag

syntax type

special characters

The behavior is consistent with an intermittent client-side rendering failure, virtualization issue, or component lifecycle problem.

7 answers

Your answer

NxKo 5 Reputation points

2026-08-06T13:44:52.7033333+00:00

Still doesn't work, now Even english causes problems. Microsoft is not what it used to be, enshitification of products is real, even for premium users
Alexandros Kanakaris 41 Reputation points

2026-08-06T19:54:29.22+00:00

I had the same issue. I disabled the following extensions on Edge.

https://microsoftedge.microsoft.com/addons/detail/centro-365/ampgmpmlobbbhjoplcbdfcgplbkbmked

https://microsoftedge.microsoft.com/addons/detail/saml-wsfederation-and-o/boffpaecgbbojpkboijhbmhecoefdehi

The problem seems to be resolved (fingers crossed).

Answer 1

Bjorn Tore Jakobsen 15

This is language dependent.
Microsoft 365 Copilot Chat seems to have lost the ability to render the codeblocks if the language in the browser is Norwegian (at the least, maybe other languages as well)

In the brower console you get :

InlineLoopLoadError Error: Cannot find module './no/CodeBlockStrings.json' i https://res.public.onecdn.static.microsoft/midgard/versionless-v2/artifactviewercsrcomponent.279d8546.chunk.js:1 35150.296794f3.chunk.js:23:47467 Je https://res.public.onecdn.static.microsoft/midgard/versionless-v2/35150.296794f3.chunk.js:23

The workaorund is to switch to English and do a hard refresh of the chat to clear the browser cache.

NxKo 5 Reputation points

2026-07-23T12:50:59.3966667+00:00

I can confirm that changing it from Slovenian to English solved the issue.
op 0 Reputation points

2026-08-06T14:20:27.5433333+00:00

Well, seems like it spread to English/German as well now. All my chats no matter if English or German are starting to fail with the same issues

Answer 2

David De Bono 10

We have exactly the same problem in the Microsoft 365 Copilot app in Norwegian. We don't want to change Windows display language, or use the web version. Since this is a known problem, Microsoft must fix it

0 comments

Answer 3

Mathias Kirkerud 11

It seems it's back for me now. 05.08.2026 08:04 i get the codeblocks now. (update) and stopped working again right after.....

NxKo 5 Reputation points

2026-08-05T06:09:33.1766667+00:00

For Slovenian language 05.08.2026 08:07 I now got partial improvement

Answer 4

Dade, Dustin 0

To add more information to this problem, I am an English speaker with English as my OS default language. I am on a Mac using OS 26.6. This has been happening for several days. This is with the standalone app.

If I use the browser version of Copilot from either Chrome or Firefox, I am able to see the snippets fine. It appears that however the standalone app is built, its causing the problem with the rendering.

0 comments

Answer 5

Sina Salam 31,216 Volunteer Moderator

Hello Ole Slupphaug,

Welcome to the Microsoft Q&A and thank you for posting your questions here.

I understand that you are having challenges with codeblocks not rendering in Microsoft 365 Copilot.

If full code blocks are not rendering and remain stuck as loading placeholders. This points to a Copilot client-side rendering or service-side UI issue, not a prompt, license, or ordinary cache problem.

The reliable way to solve it, is to:

Confirm there is no active Microsoft 365 Copilot incident in Microsoft 365 admin center > Health > Service health.
Reproduce the issue in a clean Microsoft Edge InPrivate session with extensions disabled and third-party cookies allowed.
Test the same prompt in another supported browser, another device, and another network.
Validate that your proxy, firewall, SSL inspection, DLP, CASB, DNS filtering, or browser security extensions are not blocking Microsoft 365 Copilot web assets.
Update Microsoft Edge, Microsoft Edge WebView2 Runtime, Windows, and Microsoft 365 Apps.
If the issue still reproduces in a clean browser and alternate network, raise a Microsoft 365 support case and include screenshots, timestamps, affected user account, browser version, WebView2 version, HAR file, and browser console errors.

After the clean-browser and alternate-network tests, if the code block still does not render, the issue should be treated as a Microsoft 365 Copilot product/service investigation, because the response is being generated but the code-block renderer is failing to complete. Microsoft 365 Copilot requires supported browsers, required network endpoints, licensed users, Entra ID accounts, and Microsoft 365 app readiness, so the isolation test must focus on rendering assets and service health rather than repeating basic access checks. - https://learn.microsoft.com/en-us/microsoft-365/copilot/microsoft-365-copilot-requirements, https://learn.microsoft.com/en-us/microsoft-365/copilot/microsoft-365-copilot-minimum-requirements

Use the below official resource links for more reading and steps:

I hope this is helpful. Please! Do not hesitate to let me know if you have any other questions, steps or clarifications.

Please do not close the thread by upvoting and accepting the answer if any part of it is helpful.

Ole Slupphaug 60 Reputation points

2026-07-21T06:11:55.7233333+00:00

Thank you for the reply @Sina Salam ,

The issue in the browser is not my main concern, rather it is that it occurs in the Microsoft 365 copilot desktop application. Do you have any suggestions on what to try further for that?
NxKo 5 Reputation points

2026-07-21T09:21:41.9666667+00:00

I'm facing the same issue. Both in browser and through app, code block has grayed out rows that never update/display. Worked fine until 2 weeks ago. If response is copied and pasted then the text can be seen.
Alhaj-Saleh, Yasen 20 Reputation points

2026-07-21T09:35:18.0466667+00:00

We have the same problemt. We need a solution to the destop app. I dont care if it works elsewhere.

Do you have solution for that? We all have Copilot 365 license
Cathrine F 5 Reputation points

2026-07-27T07:40:06.86+00:00

@Ole Slupphaug Changing Windows display language to English worked for me.
NxKo 5 Reputation points

2026-07-27T07:42:35.12+00:00

Yes at the moment changing Copilot's language into English is the solution. For the app this means Windows settings and for browser version the 365 settings.
David De Bono 10 Reputation points

2026-07-28T21:31:58.1466667+00:00

We have the same issue in Norwegian
Mathias Kirkerud 11 Reputation points

2026-07-29T06:16:56.58+00:00

I also have the same issue. It is not an option switching to English Windows because we have Norwegian only users. Please be so kind, adress and elevate the case
NxKo 5 Reputation points

2026-07-29T06:22:57.0433333+00:00

It's absurd this hasn't been solved the very first day. Microsoft is becoming a joke.
Mathias Kirkerud 11 Reputation points

2026-07-29T06:43:31.21+00:00

I changed the browser language to English (on top) and did ctrl+shift+R this enabeled the codeblocks in web.

Kristin Uv 5

We cannot switch the language from Norwegian to English, so there must be another way to resolve this. The license is expensive, so I expect it to be fixed in another way.

Jon T 25 Reputation points

2026-07-29T11:29:16.34+00:00

I'm seeing exactly the same issue.

I'm using the Norwegian language setting, and code blocks never finish rendering, they just stay in the loading state indefinitely. Switching the interface language to English is not a practical workaround, as I want to use Copilot in my native language.

From what I've seen, this isn't limited to Norwegian either. Reddit has reports from users with other languages, including Slovenian, experiencing the same behavior. That suggests this is a broader localization/regional issue rather than a problem with a specific user configuration.

Hopefully Microsoft can acknowledge this as a bug and prioritize a fix.
Dennis José Johannes Thomassen 0 Reputation points

2026-08-03T13:06:48.7333333+00:00

I am experiencing (and others ) are having the same issues in Norwegian.

Workaround is currently change the OS language to English, but is not a feasible solution for all.

Reinstalling, resetting and clear cache or using webrowser does not work.
Jon Petter Austnes 0 Reputation points

2026-08-03T13:11:16.4033333+00:00

Changing Microsoft 365 profile language to English fixed the issue in the desktop app. Changing browser language preference to English fixed the issue in the web version.
NxKo 5 Reputation points

2026-08-03T13:21:29.67+00:00

@Sina Salam why hasn't this been solved yet?
GMAllum 0 Reputation points

2026-08-04T11:20:16.74+00:00

And the weirdest thing is that when you switch to Swedish it works. Why only Norweigan?
Dennis José Johannes Thomassen 0 Reputation points

2026-08-06T16:52:05.2+00:00

We can see it is not working in English AND in the new design.

For me reverting back to old works on old copilot chat and see the results, but at the moment I generate a new one, it works partially. Here is an example of ps script and trying to have a python script.

If you ask for a clean format of the code, that seems to work

Problem with codeblocks not rendering in Microsoft 365 Copilot

Environment

What I have tested

Additional observations

Test 1

Test 2

Test 3

Test 4

7 answers

Your answer