Thanks for replying! Sorry for the late reply, I didn't notice. It is now usable as a result. The cause is probably that the processing of the URL below was done by Cognitive Services Language. After adding the Azure AI GPT resource, it became available the next day.
https://learn.microsoft.com/en-us/azure/cognitive-services/language-service/conversational-language-understanding/how-to/tag-utterances?tabs=portal#add-required-configurations-to- azure-openai-resource