Help Debugging Unknown Service Error

I keep getting the following error:

(automation.test_tracking_alert_testing) has an action that calls an unknown service: notify.mobile_app_sm_g991u1.

The is in a test automation for position tracking. I am getting all of the notifications I am expecting, so obviously nothing is wrong. The automation YAML is:

alias: TEST - Tracking Alert Testing - Rob
description: ""
trigger:
  - platform: state
    entity_id:
      - device_tracker.sm_g991u1
    to: not_home
    id: triggerAway
  - platform: state
    entity_id:
      - device_tracker.sm_g991u1
    to: home
    id: triggerHome
condition: []
action:
  - choose:
      - conditions:
          - condition: trigger
            id: triggerAway
        sequence:
          - service: notify.mobile_app_sm_g991u1
            data:
              message: TTS
              data:
                tts_text: >-
                  {{["Goodbye",  "Adios Amigo",  "Get out and stay out!", "Don't
                  let the door hit ya where the good Lord split ya!", "Good
                  riddance."]|random}}
                media_stream: alarm_stream_max
                priority: high
      - conditions:
          - condition: trigger
            id: triggerHome
        sequence:
          - service: notify.mobile_app_sm_g991u1
            data:
              message: TTS
              data:
                tts_text: >-
                  {{["Hello",  "Welcome Home",  "You came back, i am
                  surprised.", "Look what the cat dragged in."]|random}}
                media_stream: alarm_stream_max
                priority: high
mode: single

Where should I start looking to debug this? I have been getting it for several days now.

Thanks in advance.

i have the same. did you fix it?