This check does not work as expected as is always True:

if response.status_code == 200 or 201:

https://github.com/SoftwareAG/cumulocity-python-agent/blob/e3f697136584b2d609f88cd6c624f858dd4a0d98/deviceRegistration/newDeviceRegistration.py#L62

Because Python reads it as if (response.status_code == 200) or 201

https://docs.python.org/3/reference/expressions.html#operator-precedence