You are unable to execute a Python script with the tSystem component.
Root Cause
The Python paths are not in the service account's PATH environmental variable.
Solution
Ensure the Python paths are in the user's (not the system) PATH environmental variable.
Note: When you modify environmental variables, you need to restart the Talend component (in this case, the Remote Engine) to apply the changes.
Additional troubleshooting
Create a simple Job with a single tSystem component.
Use the tSystem command echo path, for example, on Windows use:
cmd /c echo %PATH%
If the path is present but Python is still not running, run whoami using the same tSystem component to validate the service account of the Remote Engine or JobServer.