Harmony Remote - Two buttons to trigger existing activities

Configuration Frontend
1

Seeking some assistance to create a couple of buttons that call existing Harmony activities.

I have tried the following in the Lovelace code editor for the card but I get an error - “failed to call service remote/turn_on. expected str instance, optional found”

type: horizontal-stack
cards:
  - type: button
    tap_action:
      action: call-service
      service: remote.turn_on
      data:
        activity: '36343459'
        entity: remote.harmony_hub
    name: TV
    show_icon: false
  - type: button
    tap_action:
      action: call-service
      service: remote.turn_on
      data:
        activity: '36055642'
        entity: remote.harmony_hub
    name: FM Radio
    show_icon: false

I’m using ver 2020.12.1. The harmony integration is loaded and the activities are defined in /config/harmony_13687XXX.conf

2

Change data: to service_data:
And entity: to entity_id:

3

This works for me:
Made a script and in lovelace made a button to activate this script.

tv_kijken:
  alias: TV-Kijken
  sequence:
  - service: remote.turn_on
    data:
      activity: Tv Kijken
    entity_id: remote.harmony
 mode: single
4

Thankyou! That solved it.