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.

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.

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

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.

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.....

I found this issue fixed itself in the desktop app simply by turning off the New Design toggle in the top right corner of the app.

Problem with codeblocks not rendering in Microsoft 365 Copilot

Ole Slupphaug 70

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.
Kimmo Lindholm 0 Reputation points

2026-08-09T10:28:47.4233333+00:00

Browser is Firefox. Language Finnish. Codeblocks typically C#. Last reply 3 rendered, 3 did not.
Reloading page (F5) allows them to render completely.

Not dependent on length, as now blocks with just 1 row fails also.
Noticed that there are one to three ` ticks (part or full code block start/end tags ``` ) in the end of codeblock sometimes. (Those also disappeared after reloading page)

edit: Instructed to not use codeblocks. works kinda fine.

11 answers

Bjorn Tore Jakobsen 15 Reputation points

2026-07-23T11:33:09.72+00:00

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.
Was this answer helpful?

10+ people found this answer helpful.
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

David Yeh 0 Reputation points

2026-08-09T12:56:11.5066667+00:00

This is not true, I experience it on my work copilot laptop with English as native language and my Home Desktop in Dutch.
Sign in to comment

Use comments to ask for clarification, additional information, or improvements to the question.
David De Bono 10 Reputation points

2026-07-28T21:31:04.79+00:00

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
Was this answer helpful?

10+ people found this answer helpful.

0 comments No comments
Sign in to comment

Use comments to ask for clarification, additional information, or improvements to the question.
Dade, Dustin 0 Reputation points

2026-08-06T21:38:04.3466667+00:00

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.
Was this answer helpful?

9 people found this answer helpful.

0 comments No comments
Sign in to comment

Use comments to ask for clarification, additional information, or improvements to the question.
Mathias Kirkerud 11 Reputation points

2026-08-05T06:04:39.05+00:00

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.....
Was this answer helpful?

8 people found this answer helpful.
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
Sign in to comment

Use comments to ask for clarification, additional information, or improvements to the question.
Craig Knights 0 Reputation points

2026-08-07T13:47:04.3133333+00:00

I found this issue fixed itself in the desktop app simply by turning off the New Design toggle in the top right corner of the app.
Was this answer helpful?

7 people found this answer helpful.
Dade, Dustin 0 Reputation points

2026-08-07T14:39:54.61+00:00

Unfortunately it appears that on at least the Mac standalone app they have already removed that option, or never gave this version the option to turn off the new design.

Craig Knights 0 Reputation points

2026-08-07T17:03:02.04+00:00

that's unfortunate, it's not a perm fix as I've discovered but swapping between the new and old design causes the existing chat to refresh it without regenerating, which reveals the pending code and which admittingly, sucks but its a work around, at least for some
Sign in to comment

Use comments to ask for clarification, additional information, or improvements to the question.

Problem with codeblocks not rendering in Microsoft 365 Copilot

Environment

What I have tested

Additional observations

Test 1

Test 2

Test 3

Test 4

11 answers

Your answer