If network isolation wildcards are not working properly in Application Guard, there may be a few possible causes and solutions:
1. Verify that the network isolation wildcard syntax is correct: The syntax for network isolation wildcards consists of an asterisk (*) followed by a period (.) and the domain name. For example, *.example.com. Make sure that the syntax is correct and that the wildcard is applied to the appropriate network zone (such as Internet or Intranet).
2. Check the Configuration settings: Verify that the network isolation settings are configured correctly in the Application Guard settings. You can do this by going to Windows Security > App & browser control > Exploit protection settings > Program settings > Microsoft Edge (or any other browser you are using in Application guard) > Edit > Network Isolation > Internet / Intranet. Ensure that your configuration is correct.
3. Make sure the Domain is not excluded: Verify that the domain is not excluded from network isolation. If the domain is excluded, the wildcard rule will not apply. To check if the domain is excluded, go to Windows Security > App & browser control > Exploit protection settings > Program settings > Microsoft Edge (or any other browser you are using in Application guard) > Edit > Network Isolation > Internet / Intranet. Make sure the exclude rule is not set for your domain.
4. Check If Your Browser is Running in Application Guard mode: Ensure that your browser is running in Application Guard mode. This can be verified by looking at the browser title bar. If the title shows "Microsoft Edge - Application Guard", then the browser is running in Application Guard mode. If not, close all browser windows and restart from the start menu.
5. Update Windows: Ensure that Windows and your applications are up-to-date with the latest security patches and updates. This could potentially fix issues with network isolation wildcards not working.
If you have tried all these solutions and the network isolation wildcard is still not working properly, you can try contacting the support team for your browser or Microsoft support for further assistance.
