The "Microsoft undefined Online (natural) - undefined" keep showing and won't disappear?

Question

The "Microsoft undefined Online (natural) - undefined" keep showing and won't disappear?

ali lee 10

The "Microsoft undefined Online (natural) - undefined" does not interfere with the local voices such as David, Mark, and Zira. All the Naturals reappear but go back to "Microsoft undefined Online (natural) - undefined" after a several minutes. I have tried the recommended ways, but it will not disappear can someone explain?

Alis Thorne 0 Reputation points

2026-07-22T15:50:30.5066667+00:00

Hi clary-n, have the exact same issue as above and the profile switch worked. So how do I fix my profile? Same winver results to just in case you need it.
Clary-N 15,730 Reputation points Microsoft External Staff Moderator

2026-07-23T00:27:43.6166667+00:00
Hi Alis Thorne,

Thank you for testing that and for confirming that Read Aloud works correctly in a new Edge profile.

Since the issue does not occur in the new profile, that points to something within the original Edge profile rather than Windows itself or the current Insider build.

Before recreating the profile from scratch, I suggest trying the following:

In your original profile, go to edge://settings/profiles/sync and temporarily turn off Sync. Restart Edge and test Read Aloud again.

If the issue persists, sign out of your Microsoft account in the affected profile, restart Edge then sign back in and allow the profile to sync again.

You can also try resetting Edge settings by going to edge://settings/reset and selecting Restore settings to their default values. This will not delete your favorites, passwords or browsing history.

If none of these steps help, the most practical solution may be to move to the new profile that is working correctly and re-enable sync there, as this would create a fresh profile while bringing back your synced data.

Please let me know how it goes. I'll be happy to continue investigating with you.

2 answers

Your answer

Alis Thorne 0 Reputation points

2026-07-22T15:50:30.5066667+00:00

Hi clary-n, have the exact same issue as above and the profile switch worked. So how do I fix my profile? Same winver results to just in case you need it.
Clary-N 15,730 Reputation points Microsoft External Staff Moderator

2026-07-23T00:27:43.6166667+00:00

Hi Alis Thorne,

Thank you for testing that and for confirming that Read Aloud works correctly in a new Edge profile.

Since the issue does not occur in the new profile, that points to something within the original Edge profile rather than Windows itself or the current Insider build.

Before recreating the profile from scratch, I suggest trying the following:

In your original profile, go to edge://settings/profiles/sync and temporarily turn off Sync. Restart Edge and test Read Aloud again.

If the issue persists, sign out of your Microsoft account in the affected profile, restart Edge then sign back in and allow the profile to sync again.

You can also try resetting Edge settings by going to edge://settings/reset and selecting Restore settings to their default values. This will not delete your favorites, passwords or browsing history.

If none of these steps help, the most practical solution may be to move to the new profile that is working correctly and re-enable sync there, as this would create a fresh profile while bringing back your synced data.

Please let me know how it goes. I'll be happy to continue investigating with you.

Answer 1

Jeff 0

I had the exact same issue where Edge's JavaScript speechSynthesis kept displaying the natural voices as "undefined". It would load each voice as "Microsoft undefined Online (Natural) - undefined" and then not work. The problem started for me on the same day as the original post. It seems that it was an Edge update that affected multiple users. Microsoft Edge developers may have finally fixed the issue. I was still having the problem today until I went to edge://settings/help and downloaded a new update. Version 150.0.4078.99. After restarting Edge then the natural voices started loading correctly and playing correctly.

I did not need to create a new user profile to fix the issue. I only needed to update Edge today. However, other updates done previously in the past week did not fix the issue.

Clary-N 15,730 Reputation points Microsoft External Staff Moderator

2026-07-25T07:18:15.7933333+00:00

Hi Jeff,

Thank you for sharing your experience and the solution that worked for you.

It's helpful to know that updating Edge to version 150.0.4078.99 through edge://settings/help resolved the issue and restored the natural voices.

I appreciate you providing these details, as they may help other community members who encounter the same problem.

Answer 2

Hi ali lee,

Based on the information you've provided, it appears that only the Natural voices are affected, while the locally installed voices continue to function normally. This may help narrow down the cause of the issue.

To help narrow this down further, could you let me know your Windows version and build? You can check this by pressing Windows + R, typing winver and selecting OK. Also, please confirm whether you're seeing the "Microsoft undefined Online (natural) - undefined" entries in Narrator, Edge Read Aloud or another speech-related feature.

Could you also let me know what troubleshooting steps you've already tried? This will help avoid repeating the same suggestions and allow me to focus on other possible causes of the issue.

In the meantime, I suggest checking for any pending Windows updates under Settings > Windows Update. Install all available updates, including optional updates if they are offered and then restart your PC. Speech components and voice packages can receive updates through Windows Update and a restart may help refresh those components.

You can also try removing and reinstalling the affected Natural voices. Open Settings > Accessibility > Narrator, locate the installed Natural voices, remove them, restart the computer and then download the voices again. If one of the voice packages did not install correctly or has become corrupted, reinstalling it may refresh the associated voice data.

Another useful test is to create a temporary local user account and check whether the same issue occurs there. If the voices display normally in the new account, the issue may be related to your current Windows profile. Microsoft provides instructions here: Manage User Accounts in Windows. If the same behavior occurs in the new account as well, that suggests the issue is affecting Windows at the system level rather than just your user profile.

If the voices continue to function correctly but only appear as "undefined," there is a possibility that this is a display or metadata issue within Windows or Edge. In that case, I recommend submitting feedback through the Feedback Hub app (Windows key + F) so Microsoft can review the behavior and investigate further.

Please let me know your winver results and whether the issue occurs in Narrator, Edge Read Aloud or another speech feature, and I'll be happy to look into this further.

If you have extra questions about this answer, please click "Comment".

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

ali lee 10 Reputation points

2026-07-18T15:09:40.7166667+00:00

It is version 25H2, OS build 26200.8875. The "Microsoft undefined Online (natural) - undefined" is seen in the inbuild read out-loud edge browser and read out-loud extensions.

I have tried the switch to local, but it was a temporary fit as it changes back to "Microsoft undefined Online (natural) - undefined" after several minutes.

I've checked my network setting to see if it was connection problems but there were no problems.

The restarts for the browser & computer had no effect to the "Microsoft undefined Online (natural) - undefined". This also includes clearing the cache.

The audio of the computer browser's output and volume were on.

I have also checked the browser's setting update, and it is up to date
Clary-N 15,730 Reputation points Microsoft External Staff Moderator

2026-07-21T08:49:01.82+00:00

Hi ali lee,

Thank you for the update and for confirming the troubleshooting you've already completed.

Since the issue appears specifically with Edge Read Aloud and persists despite browser updates, restarts, cache clearing and network checks, I'd like to suggest one additional test: please create a new Microsoft Edge profile and check whether the Natural voices are still shown as "Microsoft undefined Online (natural) - undefined" there.

To do this, select your profile icon in the top-right corner of Edge, choose Set up a new profile and create a new profile without importing settings. Then test Read Aloud again.

If the voices display correctly in the new profile, this would suggest the issue is related to your current Edge profile data. If the same behavior occurs in the new profile as well, it may indicate a broader issue with Edge or the current Windows Insider build rather than profile-specific corruption.

Please let me know the result and I'll be happy to continue investigating with you.
Clary-N 15,730 Reputation points Microsoft External Staff Moderator

2026-07-22T08:38:27.8766667+00:00

Hi ali lee,

May I know if you have got any chance to check my answer?

I am glad to help if you have any other questions.