Control RGB Bulb Brightness with Dimmer via MQTT

Configuration
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Hello. I’ve upgrade incandescent bulbs that were controlled by a Martin Jerry dimmer switch to RGBCCT bulbs. All devices have been flashed via Tuya Convert to Tasmota. MQTT is enabled and partially implemented. I think the error is in my MQTT definitions but I’m stuck. I want the MJ dimmer to control the brightness of the two bulbs. If I drag the brightness slider from HA, the bulbs dim properly and the display on the dimmer switch will match current state. However, if I use the pushbutton on the switch to alter the brightness, bulbs don’t respond. The slider in HA moves correctly, but bulbs just don’t see the change.

Fireplace -> Dimmer switch
FireplaceRGBx -> RGB bulbs
Fireplace Lights -> Group containing both RGB lights
image

Code from the lights.yaml file. I also set “Grouptopic” in Tasmota to “fireplace”

### Family Room 
  - platform: mqtt
    name: "Fireplace"
    state_topic: "stat/fireplace/POWER"
    command_topic: "cmnd/fireplace/POWER"
    availability_topic: "tele/fireplace/LWT"
    brightness_state_topic: "stat/fireplace/RESULT"
    brightness_command_topic: "cmnd/fireplace/Dimmer"
    brightness_scale: 100
    brightness_value_template: "{{ value_json.Dimmer }}"
    qos: 1
    payload_on: "ON"
    payload_off: "OFF"
    payload_available: "Online"
    payload_not_available: "Offline"
    retain: false
    
  - platform: mqtt
    name: "FireplaceRGB1"
    command_topic: "cmnd/fireplace1_rgbcct/POWER"
    state_topic: "tele/fireplace1_rgbcct/STATE"
    state_value_template: "{{value_json.POWER}}"
    availability_topic: "tele/fireplace1_rgbcct/LWT"
#    brightness_command_topic: "cmnd/fireplace1_rgbcct/Dimmer"
    brightness_command_topic: "cmnd/fireplace/Dimmer"
    brightness_state_topic: "tele/fireplace1_rgbcct/STATE"
    brightness_scale: 100
    on_command_type: "brightness"
    brightness_value_template: "{{value_json.Dimmer}}"
    color_temp_command_topic: "cmnd/fireplace1_rgbcct/CT"
    color_temp_state_topic: "tele/fireplace1_rgbcct/STATE"
    color_temp_value_template: "{{value_json.CT}}"
    rgb_command_topic: "cmnd/fireplace1_rgbcct/Color2"
    rgb_state_topic: "tele/fireplace1_rgbcct/STATE"
    rgb_value_template: "{{value_json.Color.split(',')[0:3]|join(',')}}"
    effect_command_topic: "cmnd/fireplace1_rgbcct/Scheme"
    effect_state_topic: "tele/fireplace1_rgbcct/STATE"
    effect_value_template: "{{value_json.Scheme}}"
    effect_list:
      - 0
      - 1
      - 2
      - 3
      - 4
    payload_on: "ON"
    payload_off: "OFF"
    payload_available: "Online"
    payload_not_available: "Offline"
    qos: 1
    retain: false

Any help would be appreciated! I realize I’ll have to change color, temperature, etc via the app.