Hello Massimiliano Rizzuto,
Thank you for using our services.
Can you please let us know what is the default configuration for page extension in web.config, section <cms>? The only configuration I have been able to make work for your scenario is if I use no extension for my pages. Then the additional Url works without problems, as well as the page editor. However if I have .aspx extensnon and for example I have:
and set the additional URL
IIS would return 404 for the pages.
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