If users are using Edge or Metro browsers then you must enable the loopback feature. This feature implements a mechanism for passing information between the Shopping client, the browser's secure sandboxed environment and the local machine. This mechanism affects these browsers as a whole and is not just restricted for use by Shopping.
Before enabling the loopback feature, check your security policy on enabling loopback and be aware of the implications of allowing access between browsers and the local machine.
Checking loopback exemption on Microsoft Edge and Metro Internet Explorer browsers
The following is valid only for Windows 8.1 and Windows 10.
Open a command-prompt as administrator on the computer you want to check, then run the following command to verify that loopback exemption was enabled during installation of the 1E Client.
Output should be:
If either of these items are missing, you can manually add them by executing the following commands. Quotes may be required around the name of the app.
The exemption from loopback restrictions can also be removed for all apps installed by using the following command:
For more information from Microsoft about CheckNetIsolation please refer to: https://docs.microsoft.com/en-us/previous-versions/windows/apps/hh780593(v=win.10).