Computer Configuration > Administrative Templates > Microsoft Edge
Both
HKLM\Software\Policies\Microsoft\Edge
Lets screen reader users get descriptions of unlabeled images on the web. If you enable or don't configure this policy, users have the option of using an anonymous Microsoft service. This service provides automatic descriptions for unlabeled images users encounter on the web when they're using a screen reader. If you disable this policy, users can't enable the Get Image Descriptions from Microsoft feature. When this feature is enabled, the content of images that need a generated description is sent to Microsoft servers to generate a description. No cookies or other user data is sent to Microsoft, and Microsoft doesn't save or log any image content.