Hi, @LeaGuiheneuf. You only have one site on your team and I checked it. It does not have an /index.html file. You can confirm this by downloading the deploy.
The sites has an /index.php file but that isn’t the same as /index.html. Also, you cannot run server-side PHP at Netlify. There is a support guide about this here:
To summarize, unless you can convert this app to static files (and I don’t know if you can do so or not), it won’t be possible to host it at Netlify.
If there are other questions or concerns, please reply here anytime.