Notify Service Getting Unexpected Error

I am seeing the following error with the notify service:

Logger: homeassistant.components.automation.exit_home_zone_message
Source: helpers/script.py:409
Integration: Automation (documentation, issues)
First occurred: 1:22:47 PM (1 occurrences)
Last logged: 1:22:47 PM

Exit Home Zone: Error executing script. Service not found for call_service at pos 1: Unable to find service notify.mobile_app_xxxx_iphone

I have checked the service and the call is valid.

Thanks,

Dan