The two Clean Trigger functions seem to expect environment variables `C1` and `C2` to exist: https://github.com/Azure-Samples/functions-python-data-cleaning-pipeline/blob/master/CleanTrigger1/clean.py#L12 https://github.com/Azure-Samples/functions-python-data-cleaning-pipeline/blob/master/CleanTrigger2/clean.py#L12 But those are not created through the ARM template