![](https://learn.microsoft.com/media/logos/logo_edge.png)
Hi @ vvxrtues,
Thanks for reaching out!
I also used the registry to reproduce this scenario, but through my research and investigation, I found that it was not just the "ExtensionInstallAllowlist" policy that caused the "Use secure DNS to specify how to lookup the network address for websites" to fail. Other policies set in the registry will also cause this setting to display "This is turned off for managed browsers".
Therefore, this problem is not caused only by the policy "ExtensionInstallAllowlist".
If the answer is helpful, please click "Accept Answer" and kindly upvote it. 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.
Best Regards,
Jinxin Wang