If you mean that Google app script that is deployed as a web app on another domain and your web page is hosted on another domain from where you are trying to retrieve the XML using JS then it can be possible that IE is preventing you from accessing the resources across different domains.
I suggest you try to go to the Internet options-> Security tab-> Select the desired zone-> Custom level
then enabled the Access data sources across domains option under the Miscellaneous category.
Restart the machine and again try to check for the issue.
If the issue still persists then I suggest you try to provide detailed steps with the sample code to reproduce the issue and also try to share the snapshot of the error may help to understand the issue in a better way.
Thanks for your understanding.
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