Hello Christian,
The example JMeter script i have made available for download in this article does not have mock data.
This means the requests in the script will not hit any valid endpoints (https://staging-platform.com is just the first dummy URL example i could think of) and the responses will return errors most likely.
The above script is a section of some valid API tests from the app I am working on but i deleted any data which might point to that app (confidentiality reasons), but if I were to replace the ‘mobServerName’ for example and other variables with their values from my app, the script would work.
Let me know if you have any other questions.
Good luck!