Google tts error

I am trying to use Neural2 or studio voices for my tts setup:

- platform: google_cloud
  key_file: google_cloud-credentials.json
  voice: en-US-Studio-O

But I keep getting this error

google.api_core.exceptions.InvalidArgument: 400 Gender neutral voices are not supported.
Looking online doesn’t bring much except for this page:
Is there a solution for this error?

I’m getting the same thing.

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