Hello @Ankit Rawat (Appcino) , Thanks for using Microsoft Q&A Platform.
As per the error message, it looks like you are trying to use the Analyze Operation under Computer Vision API with your Form Recognizer F0 pricing tier subscription key. Have you created Free tier resource under computer vision? If you haven't, please try to create a resource under this in the Azure portal and extract these keys to use the Computer Vision service: https://learn.microsoft.com/en-us/azure/ai-services/computer-vision/quickstarts-sdk/image-analysis-client-library-40?tabs=visual-studio%2Clinux&pivots=programming-language-rest-api#prerequisites
Similarly, to use the Document intelligence (DI) service please create a resource in the Azure portal. Once you have created a DI resource you can use the respective service. Please share more details regarding the service you are looking for?
Regards,
Vasavi