Getting error when tagging custom entities at Language Studio

Hi
I'm using Azure Language studio for training Custom Named entities recognition project.
After having first model successfully trained I'm suddenly faced with the following error:
When I continue adding new tags, and clicking "Save Tags" Language Studio throws me an error:
InvalidValue: Invalid api version
null
.`
I checked the outcoming request and see that LS refers to this endpoint:
https://<my-project-name>.cognitiveservices.azure.com/language/analyze-text/projects/rhcner/:import?api-version=2021-11-01-preview
which returns 400 error
So I can't continue with training project further.