How to add a custom MQTT sensor to an existing Tasmota device - Can't figure out correct "identifiers" field

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I want to add a custom MQTT sensor to an existing Tasmota device.

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How can I find the correct “identifiers” value for a Tasmota device?

  - name: "RC cellar uvlevel filtered"
    unique_id: rc_cellar_uvlevel_filtered
    state_topic: "tele/DEVBOARD5/UV_CLEAN"
    value_template: "{{ value }}"
    unit_of_measurement: "UV" 
    device:
        identifiers: "8c5dd5cfd62ef6516b78d9cebc68164a"
        name: "DEVBOARD5"
        manufacturer: "Tasmota"
        model: "ESP32-DevKit"
    force_update: true

I’ve tried multiple options (MAC address, long device ID, etc.) but always end up with an orphan device+entity.

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Is there a way to double check this value somewhere in HA, Tasmota console or MQTT logs instead of trying to guess it?

Or is it an HA limitation / can’t be done ?

Thx!