TTS says connection to local IP not possible (Sonos app)

I set up the sonos say script with the followed settings:

  - platform: google_translate
    language: 'de'
    #cache: true
    #cache_dir: /tmp/tts
    service_name: google_translate_say
    base_url: nabucasalink

And created a automation with the following settings:

delay: '00:00:05'
message: Test
sonos_entity: media_player.buro
volume: 0.5

If i now start the automation, the file is written to \config\tts and i can open it on PC with sound.
But on sonos i cannot hear anything.
If i look on the android sonos app, there appears the failure that the connection to local ip is not possible
Can anyone help me out?

Appreciate this is an old thread… I am experiencing this too. Did you find a solution to this problem?

I am using the integration, SONOS AudioClip TTS.
This works, but online over the internet, not offline.