Hi, I assume you're using Language Studio instead of QnA Maker. The deploy option should be enabled after completing these steps - add data source > edit, save, and test > click on the deployment tab. Also, confirm that you've created a cognitive search resource and linked to your language resource from Azure portal and followed all steps shown in this document. I was able to follow the steps in the linked document successfully. If you continue to have issues or have specific questions regarding the training course, please follow up with Microsoft Learn on their dedicated forums (link1, link2).
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