Below are the steps you need to do in order to get the report:
- Log into your environment.
- Click on the Help Button in the top right corner (? logo), then API documentation
- Scroll down to Entitlements. Here you can pull either User or Group entitlements. Click User
- Hit the GET button, then down to the "Try it Out" button
- Copy that request URL into a new tab/window, hit enter
- Those results you see are JSON results for all of your user's permissions. If you want this in a nice CSV format, you can use a tool like https://json-csv.com/ to convert them
The key here is that you need to be a User/Group Admin for that particular environment in order to execute the API call. You will be able to do this