@Boris Kushnarev Thanks for the question. Could you please share the document that you are trying. Can you please add more details feature that you are trying in text analytics.
Here is link to the document to Migrating to Azure Cognitive Service for Language.
If your applications are using an older version of the Text Analytics API (before v3.1), or client library (before stable v5.1.0), this article will help you upgrade your applications to use the latest version of the Azure Cognitive Service for language features.