Trying to make Google Mini say something

I am working on a script to get Google Mini to announce the currently playing playlist. The script doesn’t work so I decided to try manually through Developer Tools -> Services. Google Assistant works fine with my setup and I have the mini as media_player.office_speaker present as an entity.

I have tts in configuration.yaml as follows:

# Text to speech

tts:

  - platform: google_translate

    service_name: google_say

Then using Developer Tools, Services as follows:

Service     
tts.google_say     

Service Data (YAML, optional)          
1   entity_id: media_player.office_speaker     
2   message: "hi"

Gives no result. Any clue what might be the problem?

Have you try to use the tts.google_translate_say service?