The QnA Maker service is being retired on the 31st of March, 2025. A newer version of the question and answering capability is now available as part of Azure Cognitive Service for Language. For question answering capabilities within the Language Service, see question answering. Starting 1st October, 2022 you won’t be able to create new QnA Maker resources.
I think the last day you mentioned is 31st of March, 2025 if you already have your resource.
I hope this helps.
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I am checking on that.