Cant get service to run; exits with error

[geofflm]

Successfully installed on one Raspi and streaming to my NODE.Red dashboard.
A new install on my second Raspi fails; tried multiple times; keep getting the error below.
Sorry; but various searches/attempts have been unsuccessful..

rpi-mqtt-monitor.service - RPI MQTT Monitor
Loaded: loaded (/etc/systemd/system/rpi-mqtt-monitor.service; enabled; vendor preset: enabled)
Active: activating (auto-restart) (Result: exit-code) since Sat 2025-01-11 17:53:22 AEST; 10ms ago
Process: 1889 ExecStart=/home/username/git/rpi-mqtt-monitor/rpi_mon_env/bin/python /home/username/git/rpi-mqtt-monitor/src/rpi-cpu2mqtt.py --service (code=exited, status=217/USER)
Main PID: 1889 (code=exited, status=217/USER)
CPU: 0