Thanks for posting your question in the Microsoft Q&A forum.
You need to ensure your data source is properly connected to Azure Cognitive Search. This involves indexing your documents and making sure the index contains all the necessary fields, including the page number field.
Ensure that The column names you specify in the $select
parameter exactly match the field names in your index schema and there are no additional or incorrect parameters in your query.
Please don't forget to close up the thread here by upvoting and accept it as an answer if it is helpful