Hi.
With my team we developed a Hub Site and a WAB 3D app.
IDE Consejo de Monumentos Nacionales
The problem is that recetly we saw that the embedded WAB3D app is not showing in our hub. Instead it shows a gray space.

Logging the site it shows 404 errors when it tries to load the widgets.
https://www.arcgis.com/apps/webappviewer/widgets/Home/manifest.json?wab_dv=2.15

Is there any issue in hub or WAB that doesn't allow us to embed our app?
Greetings