Build to prod - I cant make it work

### Issue type

**I'm submitting a doubt (check one with "x")

* [x ] bug report
* [ ] feature request
* [ ] question about the decisions made in the repository

### Issue description

**Current behavior:**
The webapp is working in localhost:4200 but when I perform the npm run build:prod and then open the index.html I just get the spinner running

**Expected behavior:**
The app should work in the index.html

**Steps to reproduce:**
Just create a new build


### Other information: