It looks like the site is nested inside a directory. This can be confirmed by downloading the deployed files using the button in the following screenshot:
The following URL does work (with the subdirectory added):
This issue can likely be resolved by changing the publish directory to “public” here:
Then the “public/” will no longer be required in the URL above and the “pathless” URL below should work:
(I quoted “pathless” because, technically speaking, there is still a path of “/” but “public/” would no longer be required.)
If there are other questions or concerns, please let us know.