Thank you for your report.
You should have received a notification via the creative cloud desktop app within the last 6 months about the end of service date for the cloud based s2t service:
From the s2t help page (https://helpx.adobe.com/premiere-pro/using/speech-to-text.html)
For users running Premiere Pro 15.4, 22.0 or 22.1
Effective February 7, 2023, Speech to Text is no longer supported on Premiere Pro 15.4, 22.0, and 22.1. Upgrade to the current version of Premiere Pro for full Speech
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