Hi @mohan b Thank you for posting your question on Microsoft Q&A and for using Azure services.
As per my understanding, you are facing issue when testing command to Azure Cosmos DB you are seeing feedIterator.HasMoreResults is true and await feedIterator.ReadNextAsync() is not yielding any results. Please let me know if my understanding is not correct.
You will need to drain the results in a while loop, empty pages can be returned while there are still more results. Example code with while loop: https://github.com/Azure/azure-cosmos-dotnet-v3/blob/8a3883e8321c4dcbd03e857ea2134438a882d990/Microsoft.Azure.Cosmos.Samples/Usage/Queries/Program.cs#L207
Please let me know if that works