Speaker Diarization is disabled even for supported languages in Google Speech-to-Text API V2

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I'm trying to use Google's Speech-to-Text v2 API for transcription and speaker diarization.

Per this supported languages page, I should be able to create a Recognizer using the "long" model for the language "en-US" that supports diarization.

And yet every time I try to create such a Recognizer (I've tried using both the UI and the API), I get an error message. In the API it says "Recognizer does not support feature: speaker_diarization" and in the UI it shows the attached message:

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Am I missing something here? Why can't speaker diarization be applied?

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